That is my experience. Children learn better till 5 to 6 years old. If you just want the children to try and not to afraid of water, parent is the good teacher. Even they are 5 or 6 years old, they may need to learn more than 兩季. you are better to save more money to let the children to learn in a small group (I think two is a optimum size ) in 5 or 6 years old.