It can be great if you are willing to get into the pool.

I never thought about how early. I know our little ones loved the bath straight away but we waited to take them to the pools. I was fearful of the chlorine but never had any evidence that it was actually bad

I started swimming lessons for my dd when she was 6 months and I often wished I had started earlier because it has been a great experience for her and for me as well. Often local swimming centres often baby bonding classes for really young ones and the first “lessons” are more about getting the babies familiar with the water and encouraging good habits (kicking, floating, breath control etc). I’d check out what is on offer in your local area, try it out and see how they go, if you feel they are still too young that’s OK you can try again a bit later.