My son is 4 yrs old and is throwing up every 30 minutes, is there anything he can take?

Small sips. When a child is vomiting, the first thing to do is stop everything for an hour. If he stops, you may offer small sips of pedialyte or diluted gatorade- just a 1/2 ounce to start. Every 30 minutes, try a little more until he is keeping it down for 3-4 hours. If he continues to vomit, he should be seen by his doctor to make sure he isn't getting dehydrated.