If you have a pool - I am sure he will want to go in eventually and join whoever is in the pool.

I think I did early lessons aged 1 or 2, then it wasn't until we moved up here, and my parents put a pool in, that I got into swimming a lot - aged 8.

So I must have learnt somehow in between those times - we used to go to the beach.

I would say don't panic and don't plan so much.

Also there's people who learn quite late in life how to swim - or never get the hang of swimming but still go for a dip in a pool.