A: Why is your baby so happy and well behaved? I've tried everything with mine!
Baby A: shriiieeeeek!!!
B: I just listen to them.
Baby B: happy cooing -- Anon Guest
Parenting classes did not exist, once. People were expected to pick up parenting from their own parents. This was not always the best model. Child psychology and psychology in general began with one simple step: listening. The instant people began to learn that their infants attempt communication from birth, is the instant things change for the better.
Of course, like most things, it was not a universal nor an overnight change. There were many who thought it was some neohippy nonsense. Many of them were hostile. Some... were desperate enough to consider the results. There were scenes similar all over the world, but this one occurred in a waiting room with overworked understaff in attendance.
In such a room, one baby cries because they are bored. Then ten more babies cry because one baby is crying. Keeping them quiet is exasperating for everyone. The babies are stressed. The mothers are anxious because their babies were crying and they might look like bad mothers because of it. The few staff present were stressed because there wasn't enough of them to go around and the room was full of crying babies.