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Thank you for your question.
I am Dr. Su S. and I will try my best to help you.
As there is no other symptom since Friday, you should not get worried.
It is unlikely a contagious stomach bug.
He is eating normally.
No one else has got any sickness.
Vomiting can occur from indigestion, stress.
Nothing to worry.
I hope this information will be helpful.
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Wish your healthy life.