What can be done to discourage high birth rates in lower income families?

One would assume that since kids are a huge expense, people would wait to have them until they are stable financially, but the exact opposite is true in America. Childlessness is rising among high end couples, while low income folks continue to have higher birth rates. This is troubling, for it means that the far majority of kids will be growing up in a home where government assistance is seen as normal, and will be less likely to learn finances from their parents.

Is there any policy the government can implement that can address this issue, which will bite us in the buttocks eventually?