My niece sits with her legs back, also keeps falling while trying to stand and sometimes gets hurt on her head, is that harmful?

A. Sitting with legs at the back are you trying to say it’s W position then that is not correct second if the child is unable to balance while standing with support then that’s not correct because kids can actually walk comfortably in this stage with support and if the child is constantly falling down or getting hurt at the same place it can be an issue so start using a baby helmet for the child to protect your child