For the first few lessons, simply play in the pool with your child while he becomes accustomed to the water. This is a very important part of the program - if your child is comfortable with water streaming down his face, and happy in the pool, he will be able to easily move on to being submerged under the water in later lessons.
Slowly conditioning your child to feel water on his eyes, ears, nose, and mouth helps him to graduallu adapt to the sensation of the water on his face when he goes underwater. The best way to do this is through play.
