How long has this been going on?
How soon after a meal was he playing around?
My kid tends to vomit if he had too much to eat then runs about (it stopped after I lessen his intake per meal and fed him a bit more frequently - healthy snacks etc.)
Immunity: I give vitamin C supplements and a bit of manual honey to my son and it greatly improved his immune system (as well as buffer symptoms when he’s having cough/ cold)
Here’s a link on manuka honey benefits for kids:
http://www.parentinghealthybabies.com/health-benefits-of-manuka-honey-for-kids-and-nursing-mothers/
If you are worried that it could be something else like a stomach virus despite your kid being able to run around (some kids still can play when they’re sick), do monitor his vomit patterns and go to the doc. All the best Jocelyn!
JoceLyn Chua