if my baby born here in united states is she gonna be a us citizen even parents are undocumented immigrant or illegally overstayed visa in united states?
Yes, the child will be a US citizen if he/she is born in the US.
Your child will be a citizen of the U.S., but she cannot sponsor you until she's 21. However, you can attempt to get cancellation of removal if you can prove hardship for her, and that you have lived here at least 10 years continuously (meaning you never moved out and recrossed).
Yes, your baby will be a U.S. citizen, even if you are not in legal status in the U.S.