Instead of cash payments having considerable services like in home care, free goods like formula and diapers, parenting support and education, childcare, etc. would go a long way to making parenthood easier for people of all classes.
Universal health care would also be a huge boon, the costs of providing health care are quite high.
In the past our society seemed a lot more inclined to share and pool resources to raise the next generation... now it feels like society will only do the bare minimum to prevent kids from dying, but other than that isn't eager to take on a communal parenting role, instead forcing the entire burden on parents.
Right now, the rich are disproportionately punished for having children while the poor are basically paid for it. How about flip flopping that?
Whom you are talking about are upstart "upper middle" who have a good wage but no capital of their own, and the rich are generally happy to have them thrown under the bus rather than face them as equals.
The method of throwing under the bus is have them overwork for a wage and then second job to waste that wage on "fueling economic growth". Not turning these into anything permanent.