It depends.

If the couples afford to have plenty of children, like they have financial freedom, then it will not affect the economy. However, on the other scenario, if the other family are poor, minimum wage earner, and the father or mother is the only one that has a source of income plus they have like 5-7 children, then it could affect the population.

Overpopulation leads to poverty if the families can't afford to raise their children but still continue to make babies out of boredom, resulting to many malnourished and uneducated children that's been mostly commiting crimes in the streets because of poverty.