My 14 month old is a wonderful happy little girl, and although she was a little late to sit and never learnt to crawl I have not been worried as she seemed otherwise OK. However she recently moved up a room in nursery to a 12 to 18 month age group, and it's becoming obvious that she simply isn't as mobile as the other babies. She has recently begun to bottom shuffle, but doesn't crawl and has only pulled herself up once (unsuccessfully!). She can stand and walk holding onto 2 hands but often leans on me for support even then. I worry that she is getting trampled by the other mobile little ones and beginning to wonder if all this slowish development is significant.