My 3 year old son has been doing exactly what you have described. I too thought it was all the excitement of christmas and everything but it still happens every now and again.

I remember when I was about 15 one of my Mum's friends had to take her son to a speech pathologist and I remember her saying to her son when he was stuttering to slow down and think about what he wanted to say and to say it slower. So I've done that with Daniel and it helps a bit. But that's just for the few times its happened, if it keeps up I will be seeking help too.

If you get any good advice I might need it myself.