Dude, nations ALWAYS need population growth bc the older generation keeps on dying. If you don't reproduce yourself---you end up like Japan or Germany. Aging, dying populations. Now Germany and Japan are EXTREMELY wealthy and technologically advance. They can sustain aging and dying populations for decades thanks to their economies being hyper mechanized and massive wealth in the society.
If aging and dying populations hit a nation in their developing phase---boom, collapse. There's no other way. What you should be arguing for is a stable population growth (2, 3 kids on average etc) with a fertility rate of 2.5 kids or so...we as a nation are getting there. So that's not an issue.
Don't just go off from cliche's...learn about the issue of demographics in totality
Lol, 300 million is almost a demographic certainity for Pakistan unless something catastrophic happens.
You aren't familiar with population pyramids I believe.
Even if we control our fertility to just 2 kids on average---we will still hit 300 mark.
Nothing bad in it though..as I have tried to explain in other posts here.