My grandparents had 2 and 4 children respectively in communist Poland in the fifties in sixties, while living in what nowadays would be classified as abject pov

My grandparents had 2 and 4 children respectively in communist Poland in the fifties in sixties, while living in what nowadays would be classified as abject poverty (e.g. a 6-person family living in 400 sq ft flat). Being very, very poor and having to work 6 days a week didn't stop them from starting families. It's all about what you value in live and for them children were top priority, so they made it happen, even though they came with huge sacrifices. Obviously, people in our times just don't care about having children that strongly, so even mild (in comparison) sacrifices required are enough to make them go childless.