Essay three outline

Here's a thought for what my essay might look like;

Intro:
Define terms
Present statistics
frame the guiding question- what factors cause the drop in fertility?

Body 1
Social norm role in family size
Define term, discuss pressures to have many children (biblical? or otherwise?)
What caused this to diminish? I.e., why did the social norm move?
Present economic factors as an explanation

Body 2
Economic pressures to have many children in a developing/third-world country
How they are removed and even reversed in a developed/first world contry

Body 3
Not sure what to put here, or even if I need it... My essays run a little long anyway.

Conclusion
String the causes together in one, coherent, concise statement
Reestablish exigence with a quotation about possible effects of this drop.

Comments?