Once fertility decline has begun (or,in some cases,once it passes a certain threshold),it does not reverse.

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Once fertility decline has started and reached a certain level, it is unlikely to reverse. This is because it is the result of various factors such as changing societal norms, increased access to education and contraception, and economic development, which usually have a lasting impact. However, in some cases, policies such as incentives for larger families or improvements in healthcare and infant mortality rates may slow down or reverse fertility decline.

Once Fertility Decline Has Begun (Or,in Some Cases,once It Passes