Nosebleed.   Pinch the soft parts of the nose against the center wall for 10 minutes. Tell your child to breathe through his mouth during this time. If blood continues to come out of the nose while it is pinched, you may not be pressing on the right spot. If the nosebleed hasn't stopped after 10 minutes, insert a piece of gauze covered with vasoconstrictor nose drops (for example, Afrin) or petroleum jelly into the nostril. Squeeze again for 10 minutes. If bleeding persists, call your child's doctor but continue applying pressure in the meantime.