My son is 11 months old and is not crawling or rolling. He only says "Mamamama" and "babababa" and only says these very occasionally.
I am less worried about the crawling and rolling as he seems to have very strong legs and bears weight very well. I am however worried that he is not even close to saying words and more often than not doesn't seem to understand anything that I say to him (ie "Ben, where's the ball?" when it's right next to him - he looks blankly at me every time). How much should a 11 month old talk and understand? Am I worrying too soon?