Everybody is different and it is probably just how his gastrointestinal tract is. Some people have a faster digestive tract then others. If this is how he has always been, then it is nothing to be concerned about.
If this is something new, then he may have a slight stomach virus. It should resolve on its own over the next week or so. IF it does not, then he should get checked out by a doctor. I hope this helps. Good luck.
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