my child is 4years 2months he is getting wometing twice in between 12.00 -01.30 AM, and he is getting stomache pain, please give me a best first aid

A. hi parent your kid is 4 years old and is having occasional vomitings gs and abdominal pain, symptoms suggestive of gastritis, kindly avoid spicy foods, avoid skipping of meals, ... .can give oral lansoprazole jr...satchets for gastritis