I have a 5 yrs old son. He is an active and normal child but when he gets very excited, he has a problem in his speech. Just last month, on his birthday, he was very excited. We had planned a party for him. When his friends started arriving, he became so excited that he did not know what to speak. I noticed him stammering. Each time he started to speak, he stammered and repeated words. I was literally surprised as this never happened before. Now I have noticed this frequently and this is prominent when he is excited. Is there anything to worry? Does he need speech therapy. I am quite concerned.