2. Then open "gamedefaults.txt" with a text editor to find or locate "fertility rate". This parameter controls the population growth rate of each province, and the default value is 5. You can modify this value to increase or decrease the population growth rate as needed.
3. Secondly, set up "children born" to control the birth rate of children in various provinces. The default value is 0.03, which can be modified as needed to increase or decrease the probability of a child being born.
4. Finally, save the file, exit the editor and restart the game to see the modified effect.