I just found something relevant:
thepracticalconservative.wordpress.com/2015/10/19/marriage-and-children-in-wedlock-do-cost-100k-per-year-to-have/
The blogger there finds that median family income among married parents with children is surprisingly high (and this is ALL married parent families–all races, all economic and educational levels, all immigration statuses). Here are the medians for different numbers of children (I’ll round) with the percentage at $75k and $100k in paranethesis like this (percentage at $75k or higher/percentage at $100k or higher):
–1 child–$91k (62/44)
–2 children–$92k (62/46)
–3 children–$78k (52/37)
–4 children–$66k (42/29)
–5 children–$57k (40/28)
–6 children–$50k (38/22)
–7 children–$70k (45/27)
–8 children–$61k (46/39)
I’m pre-coffee, so if anybody is really interested, look at the Practical Conservative’s numbers–I may have miscopied. She notes that the figures also give the raw number of families at each size level. As she notes, there are certain cliffs where the number of families drops sharply. She points out to the ones after 3 and 5 children, but there’s also a big drop-off after 2, 4 and 6.
In fact, after two children, the standard pattern is that the number of families in the next bigger category tends to be 2/3 lower than the previous. That’s how we get from 10 million married parent families with 2 children to less than 17,000 married parent families in the with 8 or more children.
The Practical Conservative says, “And there you have it. A majority of households having kids in wedlock are not doing it on the cheap and significant pluralities are not doing so at larger family sizes. Definitely something for conservatives to think about when discussing family and marriage issues. Even at high incomes, it’s possible to feel broke raising kids these days because the prices are being set by very high income households.”
She doesn’t mention this, but those high household income medians for families are very relevant when it comes to house-buying time–it means that the relatively lower-income married couple is going to have a very hard time buying into a safe neighborhood.
On average, married families aren’t poor and poor families aren’t married.
I’d also point out that the income shown at different numbers of children resembles a truncated V–from 3-6 children household income is going down and down and down, but it bounces up again at 7-8 kids.
There also seems to be a major income penalty for going beyond 2 children–probably reflecting the household’s decreased ability to send a second parent out to work.
I may repost the link as its own thread, because there’s a lot of meat in here.
Something to think about for the OP. The median household income for married-couple families of 2, 3, 4 or 5+ children (they stopped counting after five kids, it’s a very small group of people nationwide going up to and past five these days) is about 90k/year. For one child it’s 85k as the median. Obviously half of all married-couples with kids are providing for them on less than the median, but it’s nearly twice as high as the national household median income, which is around 50k/yr.
This means that even many families with “many” children are not providing for them on small incomes. You don’t have to be rich to have kids, but the people having a lot of kids are not that poor as a group.