I swear by the reviews on Amazon.com, but unfortunately I did not read them before purchasing.  Our 4th son just turned 1, and celebrated his 2nd Christmas.  I just bathed him and put the dolphins in with him....believe what you read.  The rings do not stay together and the dolphins really don't sing!!  If you tap the tops of the head, nothing happens; if you lift the dolphin out of the water and slightly "smack" the water with it, it will make a noise.  Quite frankly it works better if you blow into the dolphin.  The baby got a kick out of the toy for a short time.  Maybe I'll keep it just because he can dunk the dolphins and toss them around.  Also, this toy takes up lots of room!!  I gave it 4 stars for durability since it does seem pretty sturdy.