Population growth varies across the planet. You can look it up for a specific place by searching for #TotalFertilityRate (the average number of babies per woman) for that place.
The graph below shows that TFR is
1.64 United States
1.40 Canada
1.28 China
For a stable population, TFR = 2.1. Meaning, the US population is growing slightly only because of immigration.
In South Korea, TFR = 0.84.