My baby boy is 1 year 3 months old. He is not crawling but started bottom shuffling/scooting from 7 months old. still he is doing the same and not yet started walking. Even he is not sitting by his own. If I am making him to sit then only he is sitting. For standing also, he is not standing up by himself. I am really worrying about him. But he started talking small small words and remembering the things and he can understand what we are talking. Can you suggest something on this?