When should a child start swimming?

I have always had my children in the pool. I think it is one of the most responsible things you can do as a parent. Teach them early to not be afraid of it, but also teach them how dangerous it can be. My sons are seven and twelve and they are both very independent in the water. My seven year old dives, swims underwater, etc. And he's never taken a swim class. It's just been from being around the water with me.

I think that parents should start incorporating swimming into a child's life as soon as possible. I know some parents who start their children out as soon as the doctor says that it is good for the baby. My daughter didn't learn to swim until later because of her breathing problems.