My daughter smiles more at my husband than she does me: Thoughts?

I am a new mom and this is my first child. My daughter is 4 months old and has started smiling. But the thing is, she rarely smiles at me and mostly only smiles at her dad, I mostly take care of her as we both work from home but his job is more demanding, but he only has to look at her pr say one word and she is smiling and laughing. Does she not like me as much? Is this a stupid question? ugh