The solution is actually really simple. You sterilize at birth, and then once a child reaches the age of majority they are allowed to get it reversed at zero c

The solution is actually really simple. You sterilize at birth, and then once a child reaches the age of majority they are allowed to get it reversed at zero cost simply be requesting it be done. This removes the moral hazard, and requires a positive action and conscious choice to have a child. At that point you can start making moral judgements and holding people accountable.