The replacement rate refers to the number of children needed to be born per woman in order to maintain the current population size without factoring in external factors such as immigration or emigration. It is typically expressed as a fertility rate, and for most countries, it is usually found around 2.1 children per woman. This is because not all children survive to reproductive age and not all women have children, so the replacement rate needs to be slightly higher than 2 children per woman in order to account for these factors.
