Among babies born in the United States in 1880, Martha was the 16th most popular name. By 1890, it was no longer in the top 20.
Source: Social Security Administration
More newborns arrive during July, August, and September than during any other time of the year.
Source: CDC's National Center for Health Statistics
An infant's tendency to cry when its mother is not in sight developed in animals that don't make nests to help mother and child maintain contact when mobile.
Source: J. P. Scott, Monographs of the Society for Research in Child Development
The earliest rattles were designed not to entertain children but to scare off evil spirits during life's most vulnerable moments, including giving birth.
Source: Rijksmuseum Museum for Art and History, Amsterdam