The law I would introduce would be a parenting licence. All individuals who want to have a child wiil need to pass a test that determines whether they are fit to raise children.
That can be a bit cruel.
You are right, not letting parents who cannot look after and pay for their children bring them into a poor world where they are likely to be given up for adoption and add to the myriad of social problems society faces would be a bit cruel now...
I agree with Dularn whole-heartedly, I live in a country plagued by illiteracy and children growing up in townships, 5 per family, dying young, getting diseases and going into drugs they get cheap on the street that are as much shoe-cleaner as plant, growing up to become criminals, homeless, poor and brining the economy down. This shit needs to stop.
Maybe you should start to "thin the herd" yourself a bit.....
OT: What kind of test would this be?
Jeez, why does everyone associate eugenics with genocide? That is like saying anyone who drives a VW Beetle is a hypocritical Aryan Supremist. There would be no murder, only a "you cannot have children, if you do, said children will be taken away by the government and you will have to pay a fine, if neither person in the couple can give evidence that a contraceptive was used and the pregnancy was a freak accident (after being denied permission to have children), then their ability to have children must be removed (vasectomy, Not castration).
People are also a lot more like pests than we like to admit, and our over-population does not make this better (and indeed our overpopulation of people who cannot look after themselves, the birth rate rises in poor countries and lowers in rich ones). In nature, fast breading, hardy, adaptive animals that change their environment quickly and violently are always seen as the worst pests, yet we are the epitome of all these traits.
-qualifications and ability to get a job.
-current savings and extra income.
-surety in case your job fails, you have to have someone willing to pay for the child if you can't.
-No severe hereditary conditions that would, with a high degree of certainty, give the child a very miserable life.
-No Severe STDs that could be passed onto the child at birth or that it would likely have from conception.
-The mother must not have any complications that would make pregnancy or birth too dangerous for her or the baby.
-Financial aspect, must be able to pay for the child's education, or at least get the child to state-funded education.
-Must pass a basic parenting and hazard test.
I think that is VERY reasonable, the test would have to be taken every time a new child was wanted (the medical bit could be especially open to sudden changes), and could be taken until passed. There would probably be a few more regulation laws to make this more viable, but that is the basic gist of what I would like to see.