It was very exciting for me when Emily was first able to sit independently at 5 months. I had been propping her up against the couch for a while. I was glad because she was spending much more time off her back and I thought this would help her crawl and be more comfortable on her stomach. I could not have been more wrong! My baby still hated tummy time and now wanted to sit slouching back all the time.
Sitting babies up prematurely prevents them from rolling, scooting and crawling because it does not help their muscle development. Therefore, limit sitting as much as you can and let the baby spend more time on her tummy to help develop those neck and back muscles.
If your baby does love to sit, make sure she sits on her sit bones not back on her spine. Proper early posture is essential for strong muscle development. It is common for babies to develop poor posture if they have learned to sit slouching back early on. Encourage your baby to come up onto her sitting bones by reaching up or out with both hands for any object or toy while sitting.