In the next 3 decades, most estimates are the world will peak at 9 billion, and then rapidly go into population decline, as soon China and later India join the ranks of countries with negative population growth rates. The question is what will happen in Africa, particularly sub-saharan Africa.
India's fertility rate is 2.4 children born/woman (2018 est.), which is 81st in the world. It's annual population growth rate of 1.14% (2018 est.) is 94th in the world.
The US fertility rate is 1.87 children born/woman (2018 est.), which is 142nd in the world. It's annual population growth rate of 0.8% (2018 est.) is 130th in the world.
Africa is the continent with the highest rates of population growth. If I were in Europe, I would be very afraid.
The same thing, it is just behind the curve. One of the big factors driving the birth rate is actually urbanization and population density. Africa is urbanizing at a fast rate, like Asia 30 years ago.