You are lucky if you don’t feel the cost has increased. I have children as well. The cost compared to my parents’ time is undoubtedly more expensive. The standard of living has changed, food and clothing is no longer the bare minimum to raise child. Your argument is like brick and mortar are abundant nowadays how can build a new house more expensive (if we don’t consider inflation)? You cannot build a 1950 house today, build code has changed, what people need has changed, you can’t burn wood in fireplace in most cities, you can not simply dig a well without pulling permit etc. etc.