My son Brayden also seemed to be a little slower than my other kids when it came to things involving muscle control.  He also seemed to be slower to learn how to chew his food up. I still have trouble sometimes with him choking easily.  He started walking just before he turned 15 months old.  He’s 16 1/2 months old now, and has figured out how to run, and boy does he think he’s "the man"!