You're kidding, right? Having children is infinitely beneficial to lower-class individuals - because any and all subsidies, incentives, tax benefits, etc... increases eligibility substantially.
Obvious ones being - Increase in SNAP, Increase in TANF, subsidized housing - In addition to other federal/local programs that help subsidize energy/utility bills, cell phone bills, and internet/cable bills. Tax benefits include: Child Tax Credit, and especially the Earned Income Tax Credit disproportionately benefits the lower class. See the picture below that shows eligibility for the EITC and realize the degree to which a person are royally fucked if they start making slightly more and then their benefits are cut across the board.
View attachment 43731
These are just off the top of my head - I'm sure there are plenty of other "programs" such as free-school lunch programs, free/subsidized daycare and pre-k, etc.. . Next is how we disproportionately allow student loans for families that are broke - so there is an obvious expectation for anyone who makes any decent amount of money to somehow save up $50k+ for their kids to be able to attend college.
The overwhelming majority of these programs are basically 100% eliminated by the time someone reaches any reasonable amount lower-middle class household income - say - 30-50k. It's absurd to have these levels of glass-ceilings above people's heads, because no one wants to come out of them and take on all of those items I mentioned.