1. Martin JA, Hamilton BE, Osterman MJK, Curtin SC, Mathews TJ. Division of vital statistics. Births: final data for 2012. National vital statistics reports: from the Centers for Disease Control and Prevention, National Center for Health Statistics, National Vital Statistics System, 2013;62(9):1–87.
2. Preterm birth: causes, consequences, and prevention,2007
3. Kowlessar NM, Jiang HJ, Steiner C. Hospital Stays for Newborns, 2011: statistical brief #163. Healthcare Cost and Utilization Project (HCUP) Statistical Briefs Rockville (MD), 2013.
4. Infant mortality statistics from the 2010 period linked birth/infant death data set;Matthews;Natl Vital Stat Rep,2013
5. US Department of Health and Human Services. Healthy people 2020, 2014. Available at: .