My 8month old isn't crawling yet should I be worried & she also has no teeth at all ? She's very weak in her legs but wsnts to stand up all the time so have to keep standing her up and holding her ect, I don't know if its relevant or not but she had servere reflux so wouldn't be put down much for tummy time for the first 4-5 months of her life she was also born 4 weeks early every other baby we meet at soft play seems to have been crawling from 5-6 months and already pulling themselves up !