Baby whisperer

The coolest person in the room who the baby (or babies) likes to talk to or play with, other than their parents.

Usually these people are like kinder souls who can calm confused souls of crying babies.

Baby's Mom: I don't know why or how my baby stops crying whenever my sister starts to talk with her

Baby's mom's mom: ohh so little claire is a baby whisperer huhh? She's a nice person, no wonder.