Adherence of two-children norm shall help in

Adherence to the two-children norm shall help in Stabilising ecosystem. An ecosystem is said to possess ecological stability or equilibrium if it is capable of returning to its equilibrium state after a perturbation or does not experience unexpected large changes in its characteristics across time.
Focusing on the biotic components of an ecosystem, a population or a community possesses numerical stability if the number of individuals is constant or resilient. Adhering to two children will maintain the ratio of population with the availability of resources.