Yes, if he does it lot often you must see a specialist. May be there is noting and it will go on its own but it is always better to take the expert's opinion. You know one of my cousins stutters the same way when he used to be excited but his parents never thought it too serious to show to a doctor. But as he grew up, his strutting also reduced. I mean you could still see him excited but he doesn't stutter.
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See a specialist to understand how you can help him to overcome it. It's perfectly normal but your worries will reflect in the way u deal with him when he's stuttering. So learn the tricks from a professional...
i think it is always best to visit a specialist to see if this is normal or if there is any need of professional help. it will also help you understand how you can help your child at home.