Most of this is totally optional. I have a dozen kids, and I'm sure not spending that kind of money per kid. Births are usually cheap. You can go it alone for $0 or get a midwife for $2000 to $6000. Most of us have health insurance with an out-of-pocket maximum. For example, mine tops out around $11,000. Crazy bills can usually be negotiated, with the hospital very aware that you might just not pay at all. Child care…
Are you home schooling? In CA, depending on where you live, it costs the state and tax payers 10-14k/annum per child. That’s for 12 years. Dozen kids would cost about 1.6 million for 12 years of public education. ETA: I just saw that you mentioned homeschooling. If it’s ok to ask, how much are your expenses per month and do you own your home?
Expenses are primarily food, at about $4000 per month. The rest isn't usually notable unless something is broken, such as when our 4-ton air conditioner is low on coolant or gets the fan stuck. Normally somebody needs surgery (cracked skull, rib cage correction, etc.) so my medical bills hit the yearly out-of-pocket maximum at around $11,000. We probably do 100 to 200 miles per week, fuel being $2.25, so that is pretty much nothing.
I paid off my home in 8 years. It's 3500 square feet on 0.39 acre, about 0.9 mile from the beach. I got it for about $310,000 after the crash.