he will say a word once & then never say them again!? his 2 favorite words are MAMA & BALL!! I try everything to get him to say different words & keep saying them but it's like he can't remember the words or something! can that be it? what can i do? he imitates any actions but not words!??? I'm worried b/c he has been ahead in development in all other areas. he got his first 2 teeth when he was 4 months old, crawled at 5 months stood up at 6 months & so on.