I’ve thought about this topic a little before. My thoughts led me to some narrowly applied measures.
Those who are able to provide for their children on their own? No problem, they can have as many as they can support.
Those who have a baby that they are unable to support and must turn to government assistance? The government will give them support provided they take prescribed birth control so as to prevent more government dependents. The first baby is a ‘freebie’, any that you CHOOSE to have after that are your responsibility. The government would provide contraception free of cost. It could use the implants to insure the recipient doesn’t “forget to take it”. Or it could use oral contraceptives if there were a simple way to check the drugs blood levels in recipients. If the person still gets pregnant? Well obviously abstinence would also have to be taught as the only 100% effective method of birth control.
In this way the government would not be forcing population control, and the number of children living in poverty would decrease. People would still have the right to have as many children as they wish, but the government would no longer be forced to support them.
In essence, if you want to accept government assistance for your dependents, you have to accept contraception as well. If this is against your religion, then your religious institution can help support you.
I realize that this proposal has some shortcomings, but it could be a start for ideas. Please keep your suggestions civil.