This document discusses demographic transition theory in Bangladesh. It explains that Bangladesh has experienced a transition from high birth and death rates to lower birth and death rates, as most developing countries have. This transition is occurring due to factors like improved family planning, rising costs of children, women working less, and decreased child marriage in Bangladesh. The birth rate is decreasing due to these factors as well as improved health, nutrition, and medical science, while the death rate is decreasing due to improvements in maternal and child health, food, and medical progress. This demographic transition has resulted in economic and social improvements in Bangladesh.