We got this for my daughter before she was born mainly because it matched the theme of her room. It's been attached to her crib from the time she was 1 1/2 months old until now (she's 19 mos old) and it has been a LIFESAVER. When she was a baby and just learning to fall asleep on her own, we'd lay her down in her crib, start it and the soft music, lights and swimming fish would lull her to sleep. When she got a little older, she learned how to kick the button to start it and would lull herself back to sleep if she woke up in the middle of the night. Now, as a toddler, she plays with it if she wakes up in the middle of the night or from a nap instead of crying. I really don't know what we would have done without it. It's a definite MUST HAVE!