Worried FTM

FTM here and my daughter is two months old and wants us to sit her up all the time because she can’t by herself. She can hold her head up very well but I’m worried about having her sitting up too early and it messing up her back. At what age did y’all start holding your babies to sit up? I just don’t want to hurt her in the long run or anything and idk what to do because she loves it