However, looking at the calculation of the costs, about a third of it is for housing. I guess they impute the cost of having an additional room in the house/apartment for the child. You sure don't have to outlay an additional $2,000 per year "for" the kid, but you might end up moving to a bigger place or one with a yard, etc. because of the kid.
I think this is something they should teach in sex ed classes. On top of abstinence, condom use, other forms of contraception, stuff, stuff, stuff, and all the junk you could buy if you don't have a kid.
I'm not saying that people shouldn't have kids...that's sure not sustainable (or in a way it is). It would just be interesting to put little price tags in people's mind when they make a decision about whether they want one or not.