Page 4 of this publication links number of children to education level. Seems to be constistent worldwide.
2007 World Population Data Sheet

__________________
Even if you hold the minority opinion, stick to your guns and go against the flow if that's what you truly believe. (CnRedd)

Thanks for that, but I'll throw the warning flag up.

First, it speaks to developing countries, not a developed one like the US.

Second, I have to revert to that famous old phrases, 'correlation does not equal causation'. I think while likely true, political freedom and greater personal wealth often go along with higher education. My point is that you just can't educate women into fewer children, there has to be a real and tangible incentive that the education brings to make it more desireable than having a greater number of children.

__________________

This also ties into the cultural factor, which is greatly influencing the US because of diversity. Many cultures emphasize the role of the woman as that of a wife and mother. While in modern day society that does not equate to barefoot and pregnant, nor a lack of education, it does make women of a certain cultural background (say Hispanics for example) more inclined to place high emphasis on maternity as a fulfilling role, as opposed to give it a backseat to a successful career (even success is in the eye of the beholder).

I am a Hispanic female, a college grad, and I have a high income job. Around me I see hard pushing females climbing the corporate ladder (including my boss) and I commend them for it, but that never attracted me. I wanted a comfortable living, to be accomplished at what I do, but not at the expense of having a family because to me, and I do believe this is a cultural thing, my kids are my accomplishment and my legacy. No job can give you that, . I have three children, but none of my relatives have any less than two... one is considered a lonely number, .

p.s.: no, no one in my family is on welfare,