My baby is almost 11 months and he isn't crawling yet, should i be worried? is he behind?

Not necessarily: Has he been rolling over, sitting alone, or starting to pull himself up to stand holding on to furniture? If he can do these things, his development is probably normal. Some babies skip crawling if they find another way to move around. If he isn't able to do those things, check with your doctor to find out if there is a problem. Not all children develop at the same speed.