The ratio of boys to girls born in the United States is 51 percent to 49 percent. Since 1940, an average of 91,685 more male babies have been born each year than females, a total of 5,776,130 over that 63-year period.
An early review notes that in the United States, parents — especially fathers — have shown a strong preference for sons. Couples with sons are more likely to marry and are less likely to divorce if married. Fathers also tend to spend more time with sons than with daughters.
