When my girls were newborns, they could scream bloody murder in each others ears and the other wouldnt budge. In the past month, I think my girls have developed supersonic hearing. Unfortunately, they've both been waking up due to teething and when one wakes, the other does too. My house is small so even separated, they hear each other. Its been a double screamfest every night! We did Ferber back in May but now, we have to run in the room when one screams. I miss the early oblivious days.
Re: Waking each other up!!