What if my child holds his breath as long as he can?
"This is very common when little kids throw temper tantrums," Dr. DeWitt says. If your kid is especially stubborn, he could do it until he passed out, which is his body's way of getting blood and oxygen to flow back to the brain. It should only be seconds before he's up and breathing again. If five or ten seconds pass and he's still out, call 911 and start CPR as soon as possible.