In 2013, nearly half of a million women and girls under age 20 became mothers, equal to almost one in five births in Mexico. Teenagers with lower socioeconomic status and/or indigenous backgrounds are far more likely to become adolescent mothers than better-educated, wealthier, and non-indigenous teenagers (Ward et al., The percentage of households headed by women was 29% in 2014, a share that has steadily risen from 13.5% in 1976 (INEGI, 2015). These are largely single mothers. For both men and women, Mexico lags behind the OECD average in many chronic health outcomes, such as diabetes, obesity, and heart disease.