C.D.
My 4 1/2 year old son didn't even say a word until he was almost 3. He would point to things and mumble, that's about it. We had Early Intervention for speech delay that mostly helped us help him. All of the sudden, as most people told us, words came suddenly, a week later sentences and now he can't stop talking! Be patient, keep talking to him and with him. If you are concerned, contact early intervention for an evaluation. It doesn't cost anything.