Changing norms and values about fertility occur at what stage of demographic transition?

Second stage

Explanation:

Demographic transition -

It is the model, during the development of the country, i. e., from the pre - industrial to the industrialized economic system, the movement from higher birth and death rates to the lower birth and death rate of the country, is referred to as Demographic transition.

According to this theory, the birth and death rates are interconnected with the stages of the industrial development.

According to the stage 2 of the Demographic transition -

It is referred to as the developing country phase.

The death rates reduces because of better food supply and improved sanitation, as it decreases the diseases.

Hence, from the given statement of the question,

The correct stage of demographic transition is the second stage.