Nowadays there is pressure on women to develop their careers before even thinking about having children, by which time for some women it's almost too late to have them.
I would say its more a case of women having the freedom to choose other paths like developing a career. I know 3 older women in my immediate family who openly say that they would not have married/had children if they hadn't been under great societal pressure to do so. I think the worry at the moment and the studies coming out reflect an increase in the number of men and women who are actively choosing not to have children, rather than being unable to do so?
That said, financial expectations and aspirations were much lower 50-60 years ago, and it was rare to see households dependent on two incomes. Only the very affluent could afford a new car, most people made do with a second hand vehicle and there were virtually no two car households as is common now.
As children, we had hand me down clothes and our neighbours used to swap children's clothes or pass on unneeded baby clothes to others that required them. Many requirements for children such as cots or prams were second hand as they weren't being used for long.
The foundations this way of living sat on are gone.
I remember me and my friends having 10+ year old cars and our dads were often under the bonnet doing repairs. All my (much) older siblings friends could tinker on cars also. That's largely impossible with modern day cars because of the way they are built. A family now with an older second had car faces being stuck with a potential money pit needing to regularly pay for repairs that previous generations would have done themselves.
There were fewer two car households because often mum wasn't working so had time to walk everywhere, and local shops and amenities (long gone from this area) didn't require a car to access. Living without a car is near on impossible if you've got to drop off to nursery, then drop off to school, then get to work, all by 9am, then stop off at the (out of town) supermarket on the way home because you've been at work all day.
Hand me down clothes of the past would have started at 10x the quality and durability that we see now with cheap fast production clothes and shoes (the difference in fabric/construction quality compared to even 20 years ago is stark). No-one I know buys a clothing of quality that will last to be to handed down (less readily available and prohibitively expensive), and if any do have items of clothing, toys, prams etc of high quality they are selling them onto the highest bidder to try and prop up their finances, they can't afford to pass them onto friends/family!