We started a few weeks ago. At our swim school, they take them from 6 months. The water babies classes are water familiarisation and safety (getting back to side of pool etc) up to the age of 2, then they go up a class. Our classes run all year, we just pay by the month. It doesn't go by school terms at all.

Tanya - Floaties won't keep him buoyant that young. We have a back bubble on, and arm floaties, but they don't really do anything... it's more for him to get used to them. Altho, the back bubble does enable me to just hold his hands so that he can kick a bit better.