Hello doctor, my second daughter is almost 4 months old and weigh around 7 kgs. She is able to roll and now recently she is trying to sit by herself. Even when we try to keep her lying on bed or on lap she tries to sit by moving her neck and body. Also, when we make her sit on our lap with our body support, she tries to push her body weight to move front and stand. People say that if she will sit or stand even for a moment and not for long, it will deform her back and legs. Is it true? What shall I do?