We bought one for our newborn daughter and nothing works better at getting her to sleep. From day one, she knows when she goes to her crib and hears the music, it's night night time. This model has been "improved" but I would still try to find this original. It's a little noisy but it sounds like the womb (think heart beat and water) and for some reason, she loves spinning the little red crab. It is bulky and hard to change the batteries, that's one thing they fixed on the new one but that isn't enough for me to lower the rating from 5 stars.