Two years ago when we were in Florida, I bought a swimming suit with flotations built into it from the thrift store for him. It was too big at the time, but yesterday he jumped right into it and started swimming!
He's so happy and just swims around all day. He's started jumping into the water a little bit, not too much splashing. He's also started using his arms in big strokes, just like his swim teacher told him a few years ago. He remembered everything she taught him, it just took time. I'm so proud of him.