Having more kids than YOU can afford to raise. And that means YOU pay for their schooling rather than dumping them into state run institutions (aka public schools). That means YOU have to earn the money to pay for rent, rather than sucking on the aid to dependent children teat. That means that YOU have to earn the money to pay for their medical bills instead of stealing from others with no children.
If you can't afford children, you should not have them. Having them without being able to afford them is a HUGE WASTEFUL ACT.