Going thru my family for the last 2 weeks. It's hit each kid already, but my 21 month old can't seem to shake it. His first and worst night was a week ago now.
He's then completely fine for 2 days, then randomly throws up again. Fine for 3 days, then just an hour ago thru up everything again.

This doesn't seem normal. Other than the throw up, the kid is completely fine, very hydrated, and no other issues like fever/diarrhea.

What gives? Any advice?