Having children is such an enormous responsibility that the people who realize just how enormous it is, aren't sure if they're up to the task, and have no or very few children. Those that treat their children more like thoughts, pets, or baggage are usually the ones who never actually considered what it must really be like.
It is a scientific fact that most intelligent people have few if any children, while most dumb people (if you will) have many. If you don't like "facts" and "statistics" that are made up of numbers and calculations, you could always just drop by the local elementary school (or somewhere else that children and their parents gather) and see for yourself.
Although, if you're the sort of person who thinks that every baby is cute, and that they are toys to be coo'd at and passed around, and poked, and tittered over, you are disqualified automatically.
My point? If you realize what a burden AND privilege it is to raise a child, go for it. If not, please, please, PLEASE dont' reproduce.
^^
Zaijian,
Tiger