The most important thing for me is that it is Coast Guard approved. There will be a tag or stamp on it that says if it is. It also needs to have at least one strap between the legs. Other than that, you might need to try out a couple and see what’s going to work best for you. We always heard that the ones with a neck pillow are best, so that’s what we started with. With our son, that made him float face down, which is obviously the exact opposite of what you want to have happen. It fit him perfectly, but the balance of the “flotation” aspect was off, I guess. It held him in a doggy paddle position where he had to keep his head cranked way back in order for his face to be out of the water. If he had needed a rest, he would’ve been in trouble. We switched to a different one real fast.
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