C.B.
a lot of times this is BECAUSE they are so articulate and have such good vocabularies - i know mine did this around this age, and it was because his brain was working faster than his mouth could. i would just get down on his level and take his hands, get him to look me in the eye and take a deep breath. then think about what he wanted to say, and try again. it worked, and he got over it after awhile. just another phase!