Originally Posted by lurkette

Hmmm...I think there are plusses and minuses to each number.

Zero:
Plus: No college tuition! Freeeedooooom!! Also, good for an overpopulated planet.
Minus: People keep bugging you about when you're going to squeeze one out.

One:
Plus: Kid gets undivided attention, never has to experience sibling rivalry. Also good for an overpopulated planet because it's less than the replacement rate.
Minus: Potential for loneliness, spoiled bratness.

Two:
Plus: Each has someone to play with, whomp up on. Replacement rate of reproduction = zpg.
Minus: Two college tuitions, sibling rivalry.

Three:
Plus: Middle child disrupts balance of power, provides real-life sociology laboratory.
Minus: They now outnumber you.

Four or more:
Plus: Now qualify as a "big family."
Minus: What are you, a breeder?