My baby typically eats Similac 360 total care. The store was out and I desperately needed formula so I grabbed Similac pro total comfort. Baby’s been doing fine with it, she was a little grumpy for like 2 days but she had also just had shots. Ever since she’s been fine. Today she pooped and it’s dark green I think but looks almost grey and there’s small black flecks in it. Is that typical after a formula change? It’s stressing me out but she doesn’t seem unwell.
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It sounds gross, but you can also take a pic of a dirty diaper and use Google Lens. I’ve done it. 
Chances are it’s just their little digestive system getting used to the new formula. It takes about 2 weeks for them to regulate after a change.
Also, don’t be alarmed if they suddenly become constipated, that’s also a side effect of formula changes. The FridaBaby Windi works wonders, if that’s ever an issue.
I’d say that’s pretty normal. The same thing happened when I had to switch my son from the same formula your little one was on, to Enfamil neuro pro.
I thought they just had a big recall on baby formula. Look into it to make sure it’s not on the list. Hope baby is ok💖