C.H.
My son was the same way. he did this all through pre-school. I spoke to a friend of mine who is a speech pathologist and she told me it is normal. Basically she said that he is thinking faster thatn he can talk and he is tripping on his words. It really used to bother and concern me. he is now almost 8 and is fine. It stopped when he was in kindergarten. He now has no problems talking, as a maatter of fact he does not stop. If I were you i would give it time and it will pass, but take him to the speach pathologist and see what they think If he does need help they will give it to him, or they will just tell you it is normal and it will pass. If it is a real problem and the earlier you get him help the better he will benefit from. good Luck!