So..we've noticed that swimmig with those inflatable things on his arms, he couldn't move freely. A life jacket was the way to go, so his arms could be free. But there aren't life jacket so small in production so I had to make one. I've used an old t-shirt, attached to a wetsuit and stuffed with that foamy material you can find in computer boxes when you buy a brand new one. That made it! He could move his arms without sinking.