don't be too worried as there's a negative attitude towards having kids in first-world countries due to our corporate overlords financially fucking us. China just recently introduced a 3-child policy because the Chinese population pyramid is starting to look like an upside-down cock.
I predict that once 3rd world countries fully modernize, the population will steeply decline to a much healthier balance until the government starts handing out fertility grants like food stamps but the world is once again populated with trailer trash meth smoking pregnant mothers.