I noticed it the past week or so, but thought maybe it was him using bigger sentences but not well yet. School wrote about it in his little book yesterday so I have really listened and it's bad! It's not all the time, but he goes "I-I-I-I-I want an orange" or "mum mum mu mummy mummy mummy mu mummy..." I thought maybe they were refering to when he sometimes says a word and says "tuh tuh tuh tractor" (phonetically saying the T) which I was doing with him to practise the letters he was learning at school at week! Have I caused it? This is different, he doesn't seem aware of this whereas he does when he does "tuh for..." and looks pleased. Do I go to GP? How can I help in the meantime? DO I stop him and get him to say it slowly? Ignore it?