Hi, my baby is 10 months old.. she used to sleep in her cot by herself up to a month ago, then she changed that and will only sleep if I hold her n lie her on my chest.. till last week she used to sleep by 6:30 pm, but now she won’t sleep till it’s 8:30pm is that normal for babies to change there sleep pattern suddenly?. Also she haven’t got any teeth yet, n doesn’t crawl.. I’m actually worried.. she is a happy n active baby.. but I’m getter ng worried now..