Whenever a child is missing, always check the pool first. Survival depends on a quick rescue and restarting breathing as soon as possible.
If you find a child in the water pool,immediately get the child out while calling loudly for help. If someone else is available, have them call 911. Check to make sure the child's air passages are clear. If the child is not breathing, start CPR if you are trained to do so. When the emergency number is called, follow the instructions the emergency operators provide.
If you think the child may have suffered a neck injury, such as from diving, keep the child on his or her back and brace the neck and shoulders with your hands and forearms to help keep the neck from moving until emergency help arrives. This type of immobilization minimizes further injury to the spine and is best done by someone who is trained in the technique. Keep the child still and speak in calm tones to keep the child comforted. Continue to watch for adequate breathing.