Instruct: Classify Amazon reviews into positive or negative sentiment
Query: great sleep inducer!

Our baby was fascinated with this almost right from the start. When we transitioned him from the cradle in our room to his crib @ 4 mos. we'd turn it on right away when we laid him down in the crib. He wouldn't fuss that we were leaving him in the crib - he was too wrapped up in the Ocean Wonders.Older babies can turn it on themselves easily too (which he does now @ 7mos - sometimes.) The batteries are just starting to wear down after 3 mos.+ of nightly use.We'd consider this an ESSENTIAL for a new baby & a PERFECT shower gift!