Yeah I call BS too. I have a non-parent friend who happens to believe that Finnish babies simply don't cry, ever. You take them home, they sleep through the night (or not, but you just don't hear them) and you can take them anywhere without crying. She travelled next to one who didn't cry once on an international flight. Good for you dear.

I actually read something interesting about demand feeding from an evolutionary point of view. A crying baby in the middle of the night would attract interest from predators. Demand feeding and cosleeping was necessary for survival. CIO would not have worked way back then. Seems that there was a higher survival rate for babies born to mothers with this urge. It is also how the grasp reflex came about... when we were hairy, a grasp reflex meant a baby could hang on and be carried.