Great idea, reduce the number of unwanted or accidental children, reduce the number of baby killings.
Must have valid permit to have a child signed onto by the mother and father. Stiff penalties for pregnancy without license, no abortion until penalty or jail time is served. Babies born under these circumstances to be put up for adoption.
I have fathered 5 children and none of these rules would have stopped me because my wife and I knew what we were doing and we wanted all of these kids.
Another solution: tie injectible or implantable birth control to welfare benefits. If you cannot feed your family, house them or take care of them, the female head of household and every female between 12 and 42 living there receive a Norplant injection. The contraceptive implant comes out when you no longer use food stamps, Medicaid, Social Security Disability, Section 8 housing or other welfare programs.
No abortions. No forced adoptions. Dependent population growth, most illegitimate births and most teen pregnancies are prevented.
Return to the work force, you gain the right to have kids. Or if you are married to a man who works, and no longer require welfare benefits, then you can have the implant taken out.