My daughter 6 months tried yesterday swimtrainer his girlfriend and today I bought him the same! The swimtrainer is very comfortable for the baby. He may well move the legs (learning movement in water) and arms (to grab toys). The swimtrainer allows me to go alone to the pool with my daughter and anyway to play with it, without having to keep permanent. My daughter was there installed as the picture (we need the swimtrainer is fully inflated, if the baby sinks a little bit). In short, we love it!