I just receveied this from my brother-in-law and sister-in-law while we were over thier house this past weekend. My son already has the Aquiarum gym at home. But while we were over thier house visiting my son Jordan who is 15 weeks old needed something to keep him calm. He feel in love with this the minute we put the new batteries in it. And now at home he is cranky unless he is on this mat with it playing the music.