My child almost three years yesterday'he has diarrhea tonight and after drinking a glass of milk he vomiting projectile and he complain stomach cramp?

Intestinal germ: These problems, for just a short time, are likely (in a healthy child) to come from a virus infecting his intestne. It is likely to go on for a couple of days. Give plenty of simple clear liquids like sports drinks instead of milk, but give small amounts frequently. If he vomits, he won't lose a lot and become dehydrated. If it goes more than 5 days or he has fever, call his doctor.