E.L.
I wouldn't worry about it. I have a 16 month old at home, he says mama and dada but I really don't know if he know it is us :). He also can point to body parts that he knows, but he does it when he wants...for instance I know he know where his nose is, he has pointed a zillion times...but for the last 3 days wouldn't point when asked, then all of a sudden at dinner, where's you nose, points right to it :) I think they will do things on there terms when ready!!!