Demography[r]: The study of the change in the size, density, distribution and composition of human populations over time. [e]
History[r]: Study of past human events based on evidence such as written documents. [e]
Infant mortality[r]: A concept in demography that estimates the "rate of deaths occurring in the first year of life". [e]
Social history[r]: A branch of history that examines ordinary people and their strategies of coping with life, social organizations, social movements and deliberate attempts to induce social change. [e]