content: Our son is 8 months old and we've been using the Ocean Wonders Aquarium in his crib since he was about 2 or 3 months old. He has grown to expect the same song every time he goes in for a nap or to bed for the night. There are three settings on it, one is just music, the next is music and lights (this is the setting we use), and the 3rd is music, lights, and bubbles(vibrations). Now when our son wakes in the middle of the night, he reaches up and turns his music on himself and puts himself back to sleep! When we are away from home and we bring the aquarium, it gives him a touch of home and soothes him to sleep. I recommend it often to my friends who are expecting.