Thinks for your query.
In the absence of any worrying signs like fever
, tummy ache or loose stools or bloated painful tummy it is possible that he has simple gastritis
(could be start of tummy bug) & the dark brown colour might be related to the food eaten the night before.
Can try few sips of ice cold water or a tea spoon of any antacid
syp (like digene
) for the night.
But if he vomits again dark brown or develops any of the worrying signs mentioned above please get him checked in ER.
Hope you find the information useful.