Have someone call a rescue squad (911) immediately.
Begin mouth-to-mouth breathing as soon as possible. This should be started immediately in the boat, or at the latest when the rescuer reaches shallow water. It should be continued until the child is brought to a medical facility; some children have survived long submersions (especially in cold water).
If there is any possibility of a neck injury (for example, a diving accident), protect the neck from any bending or twisting. If the child is still in the water, he or she can be helped to float on the surface until a spine board is applied or until several people can remove him while supporting his head and back as a unit.
Vomiting is common because the stomach is usually filled with water in drowning. If vomiting occurs, quickly turn the child on his or her side, face down, and try to keep the water from entering the lungs. The lungs are usually free of water because they are protected by spasm of the vocal cords. Avoid pressure on the stomach during resuscitation because it can trigger vomiting.