1914: Year Congress designated the second Sunday in May as Mother’s Day

2.1: Average number of children women today can expect to have

25.2: Average age of women in 2004 when they gave birth for the first time

55: Percentage of 15- to 44-year-olds who are mothers

81: Percentage of women 40 to 44 who are mothers

10.4 million: Number of single mothers with children younger than 18

Source: U.S. Census