What is the reason behind the Iranian authorities' promotion of larger families?

Disadvantages:

1. Overpopulation can strain resources such as food, water, and housing, leading to environmental degradation and conflict over scarce resources.
2. More children can increase financial strain on families, particularly if they are unable to adequately provide for their children's basic needs.
3. Increased population can lead to higher unemployment rates and competition for jobs.
4. Larger families can increase the burden on social welfare systems and public services.)