However, I would never ever have done this without the supervision and assistance
of a qualified
swim instructor - this was part
of a baby swim class I took. They only had us do it once per class, not repeatedly. It was indoor in a baby pool in which the water is kept warmer then average. I also bathed him immediately after to ensure the chlorine was washed off asap, and the classes were only 1/2 hour.
If you want to give this a try, please don't just do it on your own.