my baby is going to be 9 months.,.she's not sitting or crawling yet....but she balances well on her back by herself when we make her making her sit, a hinderance for her to naturally learn to sit? will it also cause the baby to walk late?

Some babies may skip a milestone and it's best to compare and make sure all other milestones are on track.

thank u....she's more into completing milestones of communication than body movements....she calls me ma when hungry....she accidentally tells hello sometimes....n she sings vavo when she wants to sleep...nowadays she whisper mixed words like "mamapapa" she kisses when we ask her to...she also says hai n bye

It's quite natural for babies to achieve and focus on one group of milestones at a time. Make sure you keep track and bring up any concerns with your doctor.