Hello I'm a mother of 2 and my oldest is 13 and my youngest is 11. My 13 year old had a problem when he was little he wasn't able to pronounce words clearly, or you just couldn't understand him I use to have him repeat himself. I took him to a speach therpist and they told me he had a phonic disorder. They said he had problems pronuncing the words because his mind is going faster than his mouth. After 3 years of speach thearpy he learned to slow down when he talked. He still has the problem today but only when he is excited. Hope this helped you.