The study looked at fertility rates in Bangladesh using data from a 1969 survey. They found that the average number of children born to women was around 7, with most surviving into adulthood. The infant mortality rate was reported to be 113, which may be lower than actual numbers. While there was a slight decrease in fertility rates over time, recent generations are having more children at a younger age. The researchers suggest that this decrease in fertility could be due to improved child survival rates, leading to longer intervals between births.