Youngest Girls Who Get Pregnant Have Highest Risk of Poor Outcomes, Study Finds

The Finding from University of Maryland School of Medicine Researchers Examines Outcomes for the First Time in the Very Young

Pregnant teens in the U.S. have long been known to face increased health risks and pregnancy complications, but a new study for the first time finds that girls ages 13 or younger who get pregnant face even greater risks. These very young girls are significantly more likely to experience preterm birth, cesarean delivery, and admission to the intensive care unit (ICU) compared to older pregnant teens. Researchers from the University of Maryland School of Medicine (UMSOM) and the University of Pennsylvania Perelman School of Medicine led the study, which was published today in the Journal of the American Medical Association (JAMA).

The researchers examined more than 90,000 delivery records for pregnant preteens, teens, and young women ages 10 to 19, and this is the first study of its kind to compare differences among the very youngest pregnant girls with those in the middle of their teenage years, and those entering adulthood. 

“Our study discovered that when it comes to childbirth, a pregnant child or very young adolescent is not simply a ‘little’ adolescent,” said corresponding study author Katherine E. Goodman, JD, PhD, Assistant Professor of Epidemiology & Public Health at UMSOM. “We found 10- to 13-year-olds had a 56 percent higher risk of preterm delivery and a 32 percent higher risk of cesarean delivery compared to those ages 14 to 17.”

The findings are based on all pregnant patients ages 10-19 who delivered at hospitals in the Premier Healthcare Database, a national resource that includes about a quarter of U.S. hospital discharges, from January 2019 through May 2021. Anthony D. Harris, MD, MPH, Professor of Epidemiology & Public Health at UMSOM, is also a coauthor of this study.

Preterm delivery occurred in 18.5 percent of pregnant adolescents ages 10 to 13; 11.6 percent of those ages 14 to 17; and 10.5 percent of young women ages 18-19. About 22 percent of the youngest age group gave birth to their babies via cesarean delivery compared to 16.4 percent of teens ages 14 to 17, and 20.1 percent of young women ages 18-19.

The researchers took into account factors that may have led to higher rates in the youngest group, such as race and ethnicity, type of insurance, and obesity status. They still found that the youngest girls had significantly increased risks compared to teens ages 14 to 17. In terms of total numbers, the vast majority of pregnancies -- nearly 68,000 -- occurred in those ages 18 to 19. Teenage pregnancies in the 14 to 17 year old group totaled nearly 23,000, compared to just 206 pregnancies in the group ages 10 to 13. More than two-thirds of those in the youngest age group identified as Black or Hispanic.

The study team considers the data they examined on ICU admissions to be preliminary and said the findings warrant confirmation in future studies. However, they still found it notable that adolescents ages 10 to 13 experienced ICU admission rates three times higher than those ages 14 to 19.

“These complicated birth outcomes matter. They can have lifelong consequences for both mother and child,” Dr. Goodman said. “Mothers who deliver preterm have a greater likelihood of developing hypertension and mental health problems, including postpartum depression and post-traumatic stress disorder. Children born preterm have a greater risk of neurodevelopmental and respiratory problems.”

The findings take on particular relevance as states determine whether to curtail access to reproductive health care based on the Supreme Court’s decision to overturn Roe v. Wade in June.

“The study findings demonstrate that an emphasis on pregnancy prevention and appropriate care if pregnancy occurs is important – with access to the full range of options, including abortion, if the pregnancy is not desired,” said study first author Beth L. Pineles, MD, PhD, Assistant Professor, Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology at the University of Pennsylvania Perelman School of Medicine. “We were surprised by how large the effects were, but they make sense due to the biological plausibility of the findings and the improved birth outcomes in low- and middle-income countries that have been able to reduce child pregnancies.”

UMSOM Dean Mark T. Gladwin, MD, who is also Vice President for Medical Affairs, University of Maryland, Baltimore, and the John Z. and Akiko K. Bowers Distinguished Professor, added: “While pregnancy in very young girls remains uncommon in the U.S., the racial and ethnic disparities remain stark and point to a pressing health need that we as a nation must address in order to close the healthcare inequity gap.”

About the University of Maryland School of Medicine

Now in its third century, the University of Maryland School of Medicine was chartered in 1807 as the first public medical school in the United States. It continues today as one of the fastest growing, top-tier biomedical research enterprises in the world -- with 46 academic departments, centers, institutes, and programs, and a faculty of more than 3,000 physicians, scientists, and allied health professionals, including members of the National Academy of Medicine and the National Academy of Sciences, and a distinguished two-time winner of the Albert E. Lasker Award in Medical Research. With an operating budget of more than $1.3 billion, the School of Medicine works closely in partnership with the University of Maryland Medical Center and Medical System to provide research-intensive, academic, and clinically based care for nearly 2 million patients each year. The School of Medicine has nearly $600 million in extramural funding, with most of its academic departments highly ranked among all medical schools in the nation in research funding. As one of the seven professional schools that make up the University of Maryland, Baltimore campus, the School of Medicine has a total population of nearly 9,000 faculty and staff, including 2,500 students, trainees, residents, and fellows. The combined School of Medicine and Medical System (“University of Maryland Medicine”) has an annual budget of over $6 billion and an economic impact of nearly $20 billion on the state and local community. The School of Medicine, which ranks as the 8th highest among public medical schools in research productivity (according to the Association of American Medical Colleges profile) is an innovator in translational medicine, with 606 active patents and 52 start-up companies. In the latest U.S. News & World Report ranking of the Best Medical Schools, published in 2021, the UM School of Medicine is ranked #9 among the 92 public medical schools in the U.S., and in the top 15 percent (#27) of all 192 public and private U.S. medical schools. The School of Medicine works locally, nationally, and globally, with research and treatment facilities in 36 countries around the world. Visit medschool.umaryland.edu