My DS 4.5 was exceptionally clear at 2 but now he gets more what did he say then he did then because he is using such complicated words. Other people don't expect him to use such big words so it takes a while for them to realize yes he just sad that. We've even had that issue with him occasional when he tries out something new, it's hysterical, he slows down his speech and gives you a look, like c'mon people stay with me here. We had been talking about him growing inside my stomach and he of course wanted the appropriate words like uterus and womb, a couple of days later he said something about when I was eating in the "gobbledygook" couldn't figure it out, finally I said to a 4 year old could you use it in a sentence, and he yelled when I was in your tummy, oh you ,meant uterus!!! LOL

DeHe