Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Work well

I started to use this bottle warmer when my son was only a few weeks old... It works great! The only thing is I wish you could push a button for a 4 ounce or 8 ounce bottle. Once you put the water in and hope that it is just enough you can not start up the warmer again until it cools down... But on the other hand if you put in to much it gets way to hot...Once you get the hang of it and your own system down like only warming 5 ounces and then adding one to cool it down it is pretty nice to use....