Help with growing babie?

This really isn't a wise choice of questions....unless you only want a gage. Every baby is completely different! My 3rd son started crawling at 4 months...I mean everywhere...not just trying! Some do not even sit up at that age. And that is perfectly fine and healthy. There are stages for the average time period but as far as time it really does vary. I would suggest going on-line and finding a guide, but do not let it worry you if your child is behind!