Maybe she’s intentionally trying to make you baby sick.Very scary at such a young age.As a mother you have to take precautions.So instead of arguing with both of them I’d address to your husband the importance of a newborn getting sick!! And tell him take his child to the Doctor’s.
You’re over reacting. She’s your SO’s child. If she was your child you wouldn’t be able to ship her off to someone else when she was sick. You either accept your SO’s child like their your own or you get rid of him as well. Ridiculous!
My daughter is 6months old, and I hardly let people around her, my SO nephew lived with us when she was a newborn but I was strict about hand washing. He’s 7 and I’m school so obviously if he was to be around her it was only after hands been washed. Now he don’t live with us and I’ve said until the flu season is over I don’t want a bunch of people even family over. My baby’s health is more important they are not used to others germs, those not around full time do not share the same germs!!! I agree with you here mama that other mom should have taken that baby Into consideration
You aren’t the babysitter, you’re a step parent. With that comes the responsibility of caring for said 6 year old, sick or not.
This isn’t okay. I’m on good terms with both my husbands child-mother’s, and even I would be upset about that.
One of them does this sort of thing all the time. He’s 12 years old and she sends him over sicker than hell not caring who he gets sick. So now we have a rule that if it’s more than a cold, he has to stay home and rest.
You have a little baby who can’t handle being sick right now. She can’t be lying about that and sending her daughter over sick. I think anyone would be upset about that. It’s not irrational.
So you’re saying if you had another child who ended up sick, you’d find elsewhere to keep said child for as long as they were sick?
I dont mean to be rude but why do you consider them different than biological? If you truly love their dad they should all be equal
Its just the possibilities of a baby dying. Nothing to serious. (Sarcasm)
I want my step children here with me when they’re sick
All these comments are so sugar coated… you’re being an outright bitch. Point blank. Stop sugar coating shit. She needs to get her ass whooped by the MOTHER. Yeah I said it, not sorry. Reality.
If it was his time to have his daughter…deal with it. I have 4 kids and when one gets sick, I try my best to keep them away from each other. But that doesn’t work all of the time. If you are going to marry this man… you have to deal with stuff like this. Period. What is he suppose to do?.. make the mother keep her because she is sick? Are you serious? Her being sick is just as his problem as it is hers. There has been a nasty bug going around where it’s pretty long lasting. Some things you have to learn how to deal with it. I’d be pissed at you for even thinking to keep my child away from me just because you don’t want the baby to get sick. I bet you probably didn’t even try to keep her away from him. Lol maybe I read your post wrong but you are the wreck less one…
Kids will get sick! It builds immunity why do you think you don’t get sick as often? Your body is used to fighting it already. And it could also be YOUR kid getting the siblings sick also. If you knew he had kids, you should know that he gets 50% of that time with the child sick or not
Everyone’s saying you can’t choose when to parent a sick child but in this case you can bc she has 2 homes and has been sick off and on for a while apparently which should had been taken care before she spread it in dads home just like you wouldn’t send your kid to school sick or day care …yall keep yelling what if the kid lived there full time??? Well that would he different …but she doesnt live there full time and im sure dad and bio mom coulda worked something out to ensure a 5 week old doesn’t get something that would kill it potentially!.. Would you send your other kid away if you had another that was sick??? Yes …yes i would if i had someone who could watch the new born or the sick kid id send one to a family memebers home for a few days if possible to allow it to be decontaminated or just so he could see his daughter …also im questioning why dad didnt take her to see a dr? And if mom has taken her to the dr dad should ask for proof of discharge papers and what they said bc if shes coughing none stop something is definitely wrong …Yall getting mad seem to froget the smallest germ could absolutely kill a newborn who has no defense against it …i even kept my son quarantined in his room when we had someone sick around and anyone who went in had to wear a face mask and scrub down then hand sanitize while he was a new born …stop making her a bad person bc she doesnt want her newborn sick shes not saying she doesnt want her step daughter there she is also expressing concern for both kids why is the step daughter still coughing and not wanting a 5 week old sick…yall a pack of wolves
Do you have pets? If she was fine one day, sick the next, sounds like allergies.
Fuck the world…just be thank full .there even keeping the child alive…
And why haven’t you taken her to a dr. Bet your baby went for his 2 week check up and shots!
I’m glad to see I’m not the only parent who is co parenting with people like this. I can see why you guys don’t see eye to eye, lol. You don’t pick and chose when to be a parent, u signed on for it when u said yes to being with your partner. Even thinking about denying his child the opportunity to see him while she’s sick is wrong let alone actually saying it so bluntly.
I get having a baby and not wanting them to get sick but that’s why you just keep them separate, wash hands frequently. If my ex husband told me OUR child(ren) couldn’t come over because they were sick I’d be pretty upset. It is not just the responsibility of the mother to keep the child when she is sick.
Wow what would u if she was actually your daughter??
i understand you have a newborn but my son is in kindergarden and was congested from the 2nd week of school in September clear up until about a week ago. you cant possibly think its reasonable to keep a child from her real father for that long. what would you do if it was your ACTUAL daughter? quarantine her?
Parents don’t get a break. If a child is sick-they’re sick under your care. I would of just tried to keep them away from each other as much as possible, practice good hand washing hygiene and hope for the best. That girl wants time with her dad. It’s not her fault she’s sick. Don’t take it out on her.
Yes. A parent doesn’t get to decide to not have their child because they are sick. A parent doesn’t care if their child is sick they still take advantage to see them anytime they can.
Um you’re definitely over reacting, she should be able to see her dad while shes sick.
I lived this my daughter is 9 weeks old and my step daughter who is 3 always comes over sick!!! I got really mad a few times but really not much we can do. The BM won’t keep her she’s too busy partying
Um the father is just as capible of taking his own kid to the drs give me a break your selfish
Its women like you I can’t stand my sons father often cancels visits with him when he is sick and my son misses out if its court ordered technically your breaking the law… Get over it make sure she washes her hands often and keep them a good distance apart do you take your child in public grocery store drs office your chances of your son getting sick there are the same why would you want his daughter to suffer and loose time with her dad just because she is sick? And if shes in school even if she is sick she can still carrying sicknesses that others at school have you and my Sons step mom could be best friends just let your sons dad enjoy time with his dr and stop.being jealous… sorry if I’m too blunt just hate how you think its just moms responsibility to take care of sick kiddos dads are parents too and capable of taking care of a sick child
I think you should be concerned about your step daughters health along with your sons.
But your child was fine right? So maybe she isn’t contagious and just has a cough that’s lasting? My child used to cough alot when she was too young for cough medicine and there was nothing to be done. So you want the child to not come over for a while month since that’s the amount of time she’s been on and off sick right? What if the child lived with you? Would you send her off somewhere?
Can’t help but laugh at this woman lol
I’ve been the BM in this situation as well and all I could do was laugh; I have two children, one is biologically my ex’s (whom we speak of now) he recently had a new baby last March and tried this one on me while the 11 year old son of the baby’s mother was also unwell and obviously at the house…
You don’t get to pick and choose parenting time, and what would you expect if you had more than one kid yourself? Totally section off a part of the house to contain the sickness?
Babies get sick, it’s how they build immunity and it’s no one being indelicate with your feelings to say the SD is still yours and your SO responsibility too.
Chill.
When you take the role of a stepmother, you handle them whether their sick or not. It’s not hard to set up a monitor and place your infant in another room if you’re that concerned. So many alternatives aside from you being selfish and inconsiderate Grow up
Being a step parent is hard I know I’m one but can you imagine how the kid feels she dint ask to be put in this position,she knows she has to share her dad with another child and that in it self must be hard on her
If she was your bio daughter would you send her away while she was sick?
No,you’d step up and take care of BITH OF YOUR KIDS like every other mom in the world does.
If you keep this up, she wont wanna be around you because your son is more important to you.
Be careful of how your treating her, she’ll remember it
Look I’m a BM of 2 a SM to 1 and I’m a nurse and I don’t think this step mom looks bad at all. Hell my oldest is sick currently and quartined to his room not allowed to come out except to use the bathroom and if I had a 5 week old baby in the house I would definitely be trying to find a place for my oldest to go weather it be his dad’s or another family member for the period of their sickness. Have y’all ever watched a baby that young with the flu or rsv hell sometimes even just a cold? I can tell you some of these babies end up on ventilators and some die. There is nothing wrong with this mom trying to protect her baby.
It’s his kid. Your kid doesn’t trump his first born. Maybe lose the little girl mentality, while you’re at it.
Guess what? When you brought your baby to the hospital , you exposed it to millions of germs.
Sounds like you’re not ok with being a stepmom and it’s crappy stepmoms like you, who give the good ones a bad name.
That’s what siblings do, share germs
If the daughter and son were both yours would you ship your daughter off to someone else because she got sick? I think you’re a very horrible person. If you are going to marry her dad she is part of that package Sick or not. Get used to it. Kids getting sick they have 12 years of school to look forward to every bug running around. I hope you’re extremely ashamed of yourself. No wonder the BM and you dont see eye to eye. You owe her a big apology. I hope your fiance takes a big step back and realizes what hes about to marry and postpone the wedding because you my dear need some help. If you cant take this girl under your wing as your own then leave the relationship or seek help.Whst happens when it’s your son that is sick? Just ship him off? I’m sorry but you arent going to know every single day he is getting better contagious sick ect either. He can have symptoms at least 3 days before any signs. Plus with kids they can have the flu. Run around the house like they are just fine. Please take a big step back and check yourself. Put that little girl in your sons shoes. Act like shes yours because if you plan on marrying him you better treat her like she is no different than your son.
We don’t take SS when he’s sick.
They should be in their bed cozy and not have to be moved or spreading germs.
Do the same thing you would have to do if you and your SO had a second bio baby and your older bio child was sick, deal with it. I understand your concern, but it is NOT difficult to keep a 5 week old baby isolated in the master bedroom while the older sick sibling visits. If you are that concerned take your stepdaughter to the hospital like you did your bio child. SMH
I don’t think you’re in the wrong at all. If it’s an option to keep a sick child away than do it. I didn’t take my baby out of the house or allow visitors until my daughter had her first round of shots and it was actually advice I was given by my daughters pediatrician.
I mean i wouldnt want the kid around either if shes sick, RSV, the flu, a common cold uh uh get that sick kid away from my home & newborn. I’m not risking my NEWBORNS LIFE nope. Call me exaggerated idc 🤷 hes a small baby that cant handle that kind of sickness yet… now the FATHER could’ve taken his girl to the doctor if she’s been sick for a MONTH, but if BM saying shes been to the doctor then obviously the girl isnt taking her medicine like shes suppose to & thats why shes been sick over a MONTH.
So if she was your biological , what you was going to do with her?
Children are sick all the time, that’s part of growing up. You are the only person you can get mad at. He had that child before you. A parents responsibility is there child even when they are sick. You cannot pick and choose when your going to be a parent. The mom didn’t sign up to take care their child everytime the kid is sick. That his child too!
If you have a issue then tell your husband to go to a hotel with his child for their visitation. The child’s still entitled to it’s dad…
I say this as a stepmom
Well it is his child and he is to parent too good luck if you keep up you will be resented and if he has to choose it maybe her over you
L a w d d d … If you don’t get this chile ! She has so much to learn about having multiple children … I think the moms in the comments handled her appropriately
I would have simply suggested changing weekends or something and remindering her that u have a new born at home so u are just looking out for their safety. Idk maybe my relationship with my fh bms is something thats not normal but if we have my ss8 and 13 from bm#1 and sd7 from bm#2 and they get sick when they r by our house we tell her and then come up with a solution either staying with us longer till they get better or they go back to bms house. Both his bms have other children bm #1 has a 1 year old and is currently pregnant know and on many occussions we have kept the boys longer and like right know my bd10 and my sd7 who we have full custody of know both have ear infections and bm#1 called to even ask us if we wanted ss8 since the girls were sick. Know bm#2 on the other hand pisses me off last weekend she had sd and told us sunday when we were 2 come and get her for the week that sd had been complaining of ear pain all weekend me being a mom ask fh y she didnt take her to urgent care i dont play when it comes to ears but no she waited for us 2 take her to the doctor so we did and of course she had an ear infection. I was so pissed.
Well if she was your biological child would you have sent her away just bcuz shes sick? You dont get to keep her from your house just bcuz youre worried about germs. My youngest just had rsv in december bcuz one of my other 4 children brought it home from school. Shit happens with kids.
Really? Putting the blame on her bio mom, when her bio dad is just as responsible for her? And shame on him, for trying to go at his BM because THEIR child is sick. HE’S JUST AS MUCH HER PARENT AS HER MOTHER IS. Tell HIM to take her in. He can take her in just as easily as her mother can. He can care for her just as easily as her mother can. He can take responsibility for HIS sick child, JUST AS EASILY AS HER MOTHER CAN. Your child is not HIS only child. He has TWO babies to think about and look after. So he should do EXACTLY THAT.
What would you do if your own child was sick? There’s your answer
Kids get sick. That’s life. My son was in kindergarten when my daughter was born and got her sick multiple times. It is what it is.
I mean. I have a 3 year old a 2 year old & a 6 month old. They get stuffy alot. All of them, at the same time. Its okay.
Is this your first baby? You said you took him to the ER after he took a “drastic” turn? Whats that mean? Did he have a fever? Or struggle to breathe? From experience i assume no because, since he is so little, they would have been quick to admit him…
I think you really might be over reacting honestly.
Uh yeah you are overreacting. That’s his child too. He’s not responsible for her if she gets sick?? Confine you and your son to your room. That’s on you to clean disinfect wash hands and keep boundaries when other people are sick. You going to send your husband away if he gets sick? What about if you get sick?
He’s her dad even when she’s sick. You have to just try to keep them apart or make sure she’s covering her mouth and washing her hands. Same as if you and your hubby had another child that was sick. And if y’all think she’s sick, take her to the Dr. A second opinion never hurts. Why ask baby mom?
Unfortunately, bc your baby’s father has another child he nor you get to pick and choose what days his child comes around! It’s a parent’s responsibility too and you’ll have to deal with it too. Dad should just take his child to his own doctor if you & he are that concerned, so that you both will know what his child has. Don’t just not want his child over bc its a convenience to you. Unfortunately, when one child gets sick others might also get sick too; you nor anyone can stop that. Talk to your childs father and get his checked on yals own too.
Sometimes I wonder how people are even able to reproduce if they cant even think straight. Kudos to you mommas out there who know how WRONG this post is! Step or biological, YOUR KILLING THIS PARENTING THING!
Yeah one thing you’ll learn fast… is how fast any baby or child can get sick. If you brought a child into the equation would you really keep your oldest child from coming over. That’s a little absurd if you as me. This is what happens when you choose to be with someone who already has a child with someone else. Smh
U cant seriously expect her to not get time with her new sibling and father? I get shes sick but kids get sick all the time and if it has been this big of an issue u both need to step up and say something and take her to the doctor yourselves instead of just taking word from her mother. U guys r definitely overreacting on this and lacking in parenting this child correctly.
Not to be rude but why didn’t you take her 2 the Dr. when she was at your house?
As paranoid as we get as mothers when our kids get sick, it’s unfortunately the inevitable. Look at it as building immunities when baby is older. Just because his daughter is sick doesn’t make her less of a daughter.
If she’s been sick for over a month and you don’t trust the mother why not take her to the doctor yourself? Is he just not supposed to see his daughter because she’s sick? I would take her to the doctor myself instead of waiting around for the mom to if you don’t believe she’s taking her.
Just of interest, at the beginning you talk about your step child, by the end, it was “we had a newborn” to “their child was sick”. Just something you might want to look at, in my humble opinion.
The same thing has happened with my boyfriend’s daughter and it ticked me off because we weren’t told that his daughter was sick. I get that kids get sick but a heads up would be nice. She (mom) also didn’t tell us when his daughter had ring worm. That irritated me too. I would just like to know these things before I let her get all up in the baby’s face.
Unpopular opinion ill get dragged for :
Shes a ftm. Asking a question. If my oldest gets sick around my newborn ill try to let her go to my mothers or somehow separate them . It’s ok to feel concerned about a newborn ESPECIALLY a first time mom. Dont come for me. Or do. Whichever. Just my 2 cents. This is why i don’t post in mom groups🤣 crucifixion for asking a question
I would be pissed off
Shes his child sick or not. You got her when you got him. If she were your bio daughter, what would you do? I say you guys should have had her checked out when you had him checked out.
You sound Ridiculous ! That is his kid too. Therefore it’s his Job as a parent to care for his daughter too…
Her dad should be able to take her to Dr. And well she’s family too have her use sanitizer be cleanly and stop being so mean to that poor little girl. You say you love her too well you weren’t worried about having her seen only your baby and honestly illness is bad this year- blame that! The bs ain’t in your control
Kids get sick…
The OP is obviously a new mom and most of you in here tearing her down for her rightfully being upset that she was LIED to about the condition of step child, which ended up with her newborn sick and in the ER.
A kid can be fine one min and not the next. Its only same as if ok at yours then back to mum sick. Kids get ill and not been nasty that kid is your partners so he has as much responsibility whether child is sick or not. If was your child living with you you couldnt isolate your child. So yes you are in wrong for been upset and the dad can take child docs or 111 if ill not all falls on one parent just because you and your partner have a family together.
If you can’t handle that then having kids in the future isn’t going to be for you. That is his child. That is your son’s sister. Even if you don’t like it, which I get that vibe from how you talked about her and the situation. Kids get sick and if you have more kids and one of your kids get sick you won’t have somewhere to isolate them. Even if she is sick it’s not solely up to her to take care of their daughter. If your son gets sick will you expect your husband to help you take care of him? Of course because he’s his father! Same goes for her. If this is something that’s been going on a while then parent up and go get her seen. You both took your son to a hospital, but didn’t think it was important enough to get her seen too even though she had to have been with you? That blows my mind that you valued one child’s health over the other.
You moms only see it as she didnt want to take her stepdaughter to the dr when she clearly stated that her and his bm dont see eye to eye now i dont know there financial situation but with a newborn those first few months are rough and the child could be on insurance and the bm not want to share that information i have an older stepdaughter and i have an older daughter that choose to live with her dad now my youngest isnt a new born anymore she is 8m old but wen either one of the older ones are sick and come over they know dont touch babys hands or face and no kisses so no she isnt over reacting especially if she had to take the baby to the er! At the end of the day she is the one taking care of the sick baby that could have been avoided
What u gonna do when u have a second child? Put the older one in the shed when it’s sick? Lol
Dealing with a sick child is being a parent. You can’t make one child more important than the other…
Visitation Isn’t cancelled due to illness unless is extreme requiring hospitalization or something. That child still needs parented even if he’s sick. Now I would have switched weekends with you and been understanding about the new baby but you guys don’t seem to have that kind of relationship.
Dad has the same responsibly as mum to care for a sick child, unfortunately at this age they can come down with a few things. Unless she has something that is high risk, she said be able to come around. What if she was your daughter living with you full-time, would you send her elsewhere
If they have shared custody, then he has proof of her insurance and he should have taken her to see a doctor if you were that worried about it. It seems to me y’all put the health of one about the other cuz neither one of you did anything about it. If she’s been sick for a while. And has been coming to your house then You and him should have gotten her seen a doctor. He does not need the mother’s permission to take his child to see a doctor.
To be upset about this is kinda ridiculous. I get that you have a brand new baby and all, but that little girl is also your husband’s baby(and now yours too). Kids get sick. You can’t keep her from her dad because she’s sick and you don’t want the baby to get sick. What happens if you have a second baby and your oldest child gets sick?
Wow I understand your concern for your baby but damn, if you have step kids they are your kids too now! You don’t get to only pick the good healthy times. Your step daughter should be cared for with the same thought and concern as your baby. You need to end the drama with her mom, you will regret it later. Be the bigger person and honestly, grow up.
That sounds ridiculous. Wow! You can just pick and choose when to have a child around or not?? Its called…keep the baby away from sick people. Use Lysol on doorknobs, lightswitces, etc. Hand sanitizer, teach the girl proper hygiene. It’s not like the newborn can walk around…if he got sick you didn’t protect him enough. You probably spread the germs yourself. I have 5 kids. A set of twin girls, when all the kids were babies, I took ALL precautions, you dont just tell people to stay away!! This sounds immature!
Petty…(your)child (their) child…he’s the father of both if he’s with you when will there ever be a need for your child to go to BM’s house he’s responsible for his daughter also…should he have gone to BM’s house to spend the weekend or just NOT see his daughter because of your son after all your just the (step)mom at (your) house🤷
This is sad I mean wow
I think you guys should have taken her to the doctor and for those of you tearing her down shame on you she has a right to feel her feelings and the biological mom should have told them the truth especially with a newborn in the house
Y’all need to stop tearing the poor mom down. Seriously, she has every right to be concerned. It means she is a GOOD mom and wants to keep her infant safe. Her baby had to go to the ER and the older child should have been kept at her moms until better for the babies safety.
To be fair this mom sounds like a first time mom and is concerned about her new born… we were all crazy and overreacted when our first babies were small. Now I get they can’t pick and choose when to have their older daughter but I can see how this would upset her and I would hope that the BM would understand and try to help with scheduling, the new baby is her daughters sibling after all and newborns are very vulnerable to illness. Sounds like a crappy situation, glad to here the baby is ok
I get where ur coming from as ur babe is so little but shared custody is just that so sick or not.
I don’t understand y u n her dad just didn’t take her to the doctor when u seen she wasn’t well is the mum can’t really be trusted with actually taking her
I’m not bashing in any way but I have three children and when one gets sick I don’t get the option to send them off somewhere. When my youngest finally came home from the nicu my middle child had rsv. I did what any mother of multiple children would do and tried my best to keep them apart. I’m saying this to you to just maybe let you see a different perspective not to shame you in any way
Uh so her dad isn’t a parent or what?
If your stepdaughter lived with you how would you handle her being sick? I know having a tiny tiny is a lot to worry about but kids have siblings and it’s just life kids pass germs back and forth. now if it were something like the flu or chicken pox or something like that and it was possible to avoid exposure with the baby so young then i could see but in this case i think it’s unfair to expect your husband to sacrifice his time with his daughter.
Would you send your child away if your child was poorly when your partners child comes over? I think not! Stop been ridiculous you sound like your just jealous of the poor child. Just because she’s poorly does not mean she can’t go to her dad’s hes still her parent he should still look after poorly or not it takes 2 to make a child!!
The problem here started with lack of communication and accusations . The first thing you said is you and BM don’t get along because you don’t see eye to eye re her parenting . Her style of parenting is not your right to weigh in on . Period ! You can have your opinions and share them with your fiancé if you need to vent but that’s it . Or life as a bonus parent is going to suck and be full of constant riff between all of you . Love and be there for your bonus daughter it’s not for you to decide how the BM parents . It is the dads job to work with BM. Trying to pull rank as a new or future step parent will only encourage BM to exercise her right to make sure you have NO rights related to her child . And she can do this . If you had open communication dad could have shared his concerns about possibly reducing risk of sickness and ask BM If she was available and open to keeping daughter for weekend . Although like all these folks have said …custody is custody and you don’t get to pick and chose when you have your kids depending if it works for you. It just doesn’t work that way . I’m sure if dad and BM had a good coparenting relationship they could have worked out a good solution for everyone . I’ve lived in both situations and if you decide to challenge , bash and call names you better buckle up for a hell of a ride . If you put that child first put the judgement , possessiveness and negativity aside and be the best support staff you can , you will have a far better chance at having a healthy relationship with all involved . That’s just for starters . Do the right thing for the kid always or everyone loses. So…kids get sick , who cares who knew or who didn’t . It doesnt fucking matter …your day your deal . You all need to not be bitter and learn how to be chill together for this little girl bottom line ! Good luck and always remember before you pop off about something “how will this affect my bonus daughter?”
Your overacting! What the child lived with you full time? You gonna send her away everytime she is sick? No you clean extra take her to the doctors yourself also this will only help your baby build up there immunity
I don’t see a problem. I’d be scared as hell for my newborn baby too! Some people take a little cough lightly yet, it could turn into something so much more serious in a baby. But I guess all these people haven’t seen a baby on a respirator, heavily sedated with tubes everywhere. I feel like as responsible adults, it’s not “pushing away the child” as if they’re being mean and don’t want her. I feel they should all know the risk and it’s just a better idea to keep her with her mom until the cough is all cleared up! People act like she’s being abandoned or something. No she’s not. She’s with her MOTHER for Christ sake. I wouldn’t mind keeping my child to help out. I wouldn’t think the father is some kinda absent dad either.
You are only engaged so no you’re not a step-mom. Maybe she was fine until coming to your house. You know they just don’t get sick at home. Also your son will get sick, you can’t stop that. You need to grow up.
She sent “her child” because your man is this child’s father.
Maybe she started with it Sat u said she was fine Friday
You have another child if you are involved with someone who has children, you don’t get to decide if they’re sick he or you don’t have to parent. Going to the ER you likely exposed the new baby to more than what your beautiful 6 yo step daughter brought home and yes that is her home if her daddy lives there.
There can be no difference between her and the new baby. Find some common ground with her mama or life will always be a cluster, her mom should feel like you love her baby with all your heart that’s all most mothers would want.
I understand your concern for your newborn, I do. However if you had other biological children of your own that was sick (because all kids get sick often, especially school aged) would you require them to leave your house until they are better? Or is it just because it is your step child? This child sick or otherwise deserves to be with her dad, and even if you have a 5 week old. Teach the 6 yo the proper way to sanitize, wash hands and be cautious not to spread germs. But she shouldn’t be dismissed, your SO is her DAD, so if she is sick he can take care of her as well! I do think your BM is reckless for sure and this child’s father needs to step up and take this poor sick little girl to the doctors and get her the treatment she needs. If BM refuses then maybe a new custody agreement and rules needs to be set for this child’s sake.