 The baby boom was most prominent among educated and economically active women.The baby boom ended with the significant decline in fertility in the 1960s and 1970s which was later called by demographers the baby-bust.Economist and demographer Richard Easterlin in his "Twentieth Century American Population Growth" (2000), explains the growth pattern of the American population in the 20th century by examining the fertility rate fluctuations and the decreasing mortality rate.