Feeling overwhelmed

I have a mixed raced baby 👶🏽 never experienced this, don’t really think people would assume its not yours as we live in a diverse society x so don’t stress too much x

Like this is a legit concern you have?

I don’t understand the “please don’t judge” part of your post.
But the rest, in my experience
I’m mixed black and white, my son is mixed black, white, Korean. The few people who have asked or said anything to me get whatever mood I’m in. Some times I’ll say, “oh I just found him” others I just smile and walk away or I say “made him myself” it’s really not something I encounter much even being in a place that is predominantly white. You don’t have to answer anything to anyone.

Well first of all I've definitely seen some unfortunate looking mixed babies/kids and i have never heard of anyone questioning the parentage. Also, sounds like you may not have this "problem" anyway depending on who the father is. I'm hoping it's not a mixed baby since you already seem to have trouble even thinking about being the mom of a biracial child.. It's not that time consuming to say thank you while passing someone in the cereal aisle. I have 4 kids under 7 and my husband is 7ft tall and we're able to live a normal life even though people talk to us everywhere we go.

Yes, I literally had a guy say, “oh this is YOUR baby?!” To me lol. Or people will make comments on her hair being black (because apparently it’s such a shock that my daughter wouldn’t be fair haired like me).

People are nosy and a lot of other white people in particular (from what I’ve observed) have trouble comprehending mixed babies and then get curious to the point of nosiness. It’s up to you how much info you share. Even a simple “she’s mine” is fine. You don’t have to be polite or over-explain.
I’m white but have been starting to learn about mixed experiences so I have a better understanding of what my daughter may go through. I’ve learned it’s important for a lot of mixed people to learn they have agency in how much info they share about themselves too, particularly regarding their background. You, nor your child as this starts to become a situation, owe anybody anything.
NOT that being mixed is shameful, I just mean if people are being invasive.

You’re worried people will ask you who the baby belongs to and you don’t know who the dad is?
Is that what I’m reading?

Is your concern that your child will be discriminated against or that you don’t know your child’s father? In your “concern”you yourself are coming off racist? What are we going to judge? The fact that the father is maybe black? Is this rage bait?