We are using the playtex drop-ins again. We used them a few years ago with DS#1 and never had this problem at the same daycare. The liners are not melting but the actual bottle part is melting from the warmer. The are using one of the First Year models. Anyone else have this problem? At home we warm up a plastic cup of water in the microwave then set the bottle in that to warm it up with no problems. I hate to spend the money to buy all new bottles and nipples. They suggested buying cheap bottles to pour my bottles into just for warming then pour it back into the playtex bottles but that's just more bottles to wash each night - PITA! Any ideas?