Final answer:
The reduction in family size in Bangladesh is primarily credited to improved child survival and increased educational opportunities, along with a significant focus on women's education and family planning services, leading to a phenomenon known as the demographic transition.
Step-by-step explanation:
According to the video ‘Truth about Population’, the reduction in family size in Bangladesh is a result of an improvement of child survival and more children attending schools. In addition, there have been significant efforts towards educating women and promoting better understanding and access to family planning, which have correlated with reduced birthrates in many societies, including Bangladesh. Notably, this shift in demographic patterns is known as the demographic transition, where as societies become more economically secure and urbanized, they tend to experience a decline in birth rates, eventually resulting in smaller family sizes.
In the context of Bangladesh, it's also worth noting that despite the cultural preferences of Muslims, practical approaches and common sense regarding population control have been effectively implemented, overcoming potential religious barriers to family planning. The government's increased support for women's health, access to birth control, and family planning services have all contributed to the decline in family sizes.