As someone who wants a quiver full of children, I found this article insightful. It discusses the healthy spacing of childen and even mentions using breastfeeding as an aid. Awesome!
Lo, children are an heritage of the Lord: and the fruit of the womb is his reward. As arrows are in the hand of a mighty man; so are the children of the youth. Happy is the man that hath his quiver full of them: they shall not be ashamed, but they shall speak with the enemies in the gate. ~Psalms 127: 3-5