My son is 10 months old and at 9 months, he had "mama" and "dada" down with a "hi" tossed in there sometimes. Now it has stopped completely. He still babbles but there aren't any words. I read to him and talk to him but the last 3 weeks, I haven't heard a word. Is this normal? Should I be worried if this is a sign of future problems? I am pretty laid back about things and was just hoping this would work itself out but if there's any suggestions, let me know! I would appreciate it!!! Thanks.