Did you know that James Earl Jones stuttered as a child? Can you imagine the world missing out on that voice?! Anywho, my son went through the same stage, just like everyone else says. Also, like your little boy, my son asked why he couldn't talk right. I simply told him that sometimes his mind works faster than his mouth can keep up with. I helped him slow down and think about what he was trying to say, and within a couple weeks, it started getting better. Also, if your son is anything like mine, he might get really upset when he does start to stutter, and the best thing you can do is give him a hug and let him know that you are there for him.