ok. So my son is 18.5 months old. I think he has a fairly large vocab. Of course most times I am the only one who knows what he is saying, but I can hear the words he is trying to use. Just an example, he can say garage, Didney(disney) eggie(could kill my husband for not saying egg), boat the normal pop pop, dada mam, nana, susie, cat etc. These are all fairly clear. The problem? if its really a problem , is the word yes. He will not say yes. He will say Ahh. Always. I usually always say yes to him then get whatever it is he wants. But I think it is driving his daycare teacher insane. When I was in there she said oh he can say yes - and then proceeds to try to get him to say yes but he just hung his head. I know she is always trying to get him to say yes instead of ahh. So is this really a problem? I just figured when he got a little older he would master yes and that would be then end of it. For the record, yogurt is ogre...so he doesn't have the y there either. Any thoughts?