I'm dealing with this issue now too with a 15 mnth dcb. I am able to have the other 4 dcbs in separate rooms with white noise on in each room and the others seems to be able to tune the cried out. I had same problem with his 3 yr old brother who cried like torture for 3 months. I contemplated terminating but decided to stick it out because they are no trouble otherwise. Now the 3 yr old needs me to wake him up and he's my best kid. It's tough tho. This little guy already starts hyper ventilating after lunch b/c he knows nap time is coming. Like he thinks he's the only one in nap and everyone is still playing. Or like phobia. He's an angel otherwise. I'm trying to to tune him out while I'm on different floor,but it's hard! I know it'll be over at some point.