teaching kids to swim early is important.We had the kids in swimming lessons by the time they could walk because we canoed so much and we had a pool where we lived so my wife worried about them.
When my daughter was turning 6 and my son 4 1/2 we sailed the USVI and BVI. We spent our days snorkeling and on one occasion the 4 of us swam from St. John to a small cay about 200 yards away in at least 50 feet of water so they're pretty fearless around water. The scout swim thing was easy for him and it just steamed me that he wasn't allowed to have the award he earned along with kids much older.
ours learnt at 12 months
they still have lessons weekly. at 4 my daughter can do freestyle.