Teenage pregnancy rates remain high in the United States, with 3108 pregnancies among adolescents aged between 10 and 14 years in 2013. Extensive studies show that pregnancies in teenagers have more risks that those in women aged 20 to 29 years old, particularly in regard to premature births, low birth weight, hypertension, pre-eclampsia and eclampsia, anaemia and neonatal death (American Journal of Obstetrics and Gynecology 2015; 213: 95. e 1-8).