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The Pfizer-BioNTech and Moderna COVID-19 vaccines may offer slightly more protection during pregnancy against SARS-CoV-2, compared to the Jansen/Johnson & Johnson vaccine, suggests a study funded by the National Institutes of Health. Vaccination during the first and third trimesters appears to result in higher antibody-stimulated immune responses than vaccination in the second trimester. It also may lead to greater transfer of antibodies from maternal blood to the placenta.

Giving the hormone adiponectin to pregnant mice with obesity prevented later life obesity and related health conditions in their offspring, according to a study funded by the National Institutes of Health. The findings suggest that adiponectin, a hormone produced by fat cells, could play a role in reducing the lifelong obesity risk of children born to mothers with obesity during pregnancy.

The increase in pregnancy complications linked to air pollution exposure could result from the pollutants’ direct effects on the placenta, suggests a study in mice funded by the National Institutes of Health. Placentas of mice exposed to a mixture of common urban air pollutants before and during pregnancy were inflamed and had a loss of blood vessel cells. The study authors say the findings could provide insight into how air pollution might affect pregnancies and lead to strategies for preventing pregnancy complications.

Maternal obesity before pregnancy may increase the risk of asthma in early childhood, suggests a study by the National Institutes of Health. Children born to mothers with obesity were more likely than those born to mothers without obesity to have persistent wheezing, an indication of asthma.

A new method to detect genetic material from the placenta in the blood of pregnant people could potentially identify the risk for gestational, or pregnancy-related, diabetes in the first trimester, suggests a small study funded by the National Institutes of Health.

The placenta supports pregnancy and influences the lifelong health of both mother and child. Yet it is the least understood, and least studied, of all human organs. In a guest post for the NIH Director’s Blog, Dr. Bianchi discusses work from NICHD’s Human Placenta Project to understand how the placenta functions in real time during pregnancy.

The Division of Intramural Research provides fundamental knowledge about the nature and behavior of living systems through basic, clinical, and population-based research.

Researchers have developed a calculator to estimate the risk that cytomegalovirus (CMV) will pass to a fetus during pregnancy. By offering a noninvasive way to predict the chance of congenital CMV based on individual characteristics, this tool may help healthcare providers counsel pregnant people with CMV.

The Division of Intramural Research provides fundamental knowledge about the nature and behavior of living systems through basic, clinical, and population-based research.

To help spur innovation against a growing maternal health crisis, NICHD launched the Decoding Maternal Morbidity Data Challenge last year. Learn about the winning proposals.

Life-threatening pregnancy complications known as severe maternal morbidity (SMM) appear to be associated with an increased length of hospital stay for infants and an increase in the cost of caring for them, suggests a study funded by the National Institutes of Health. The findings support the hypothesis that infants of mothers with SMM may also be at risk for severe complications. The authors concluded that helping patients to reduce their risk factors—in early pregnancy or before conception—may reduce the chances for SMM and improve the health of infants.

Vaccinating women against SARS-CoV-2 in mid to late pregnancy could provide their infants at least some protection against COVID-19 through six months of age, suggests a small study funded by the National Institutes of Health. Compared to infants born to mothers who had COVID-19 during pregnancy, infants born to vaccinated mothers were much more likely to have antibodies against the virus.

Pregnant women with COVID-19 appear to be at greater risk for common pregnancy complications—in addition to health risks from the virus—than pregnant women without COVID-19, suggests a study funded by the National Institutes of Health.

Infants born during the pandemic—regardless of whether their mothers had COVID-19 during pregnancy—scored slightly lower on certain tests of neurodevelopment at 6 months old, compared to a similar group of infants born before the pandemic, according to a study funded by the National Institutes of Health. The findings suggest that children born during the pandemic may need long-term monitoring to rapidly identify any future lags in development. The researchers theorized that maternal stress resulting from the pandemic could have effects on children’s neurodevelopment.

A new study funded by the National Institutes of Health contradicts the current recommendation that women with obesity should lose weight before trying to conceive. The study of more than 300 women with obesity found no difference in the proportion of live births among women with unexplained infertility who lost weight before infertility treatment and a similar group who did not lose weight before treatment.

Small NIH study contributes to understanding of COVID-19 during pregnancy.

An individual’s risk for death by suicide may begin before they are born, suggests a study by researchers at the National Institutes of Health. The authors compared pregnancy and birth records of nearly 50,000 individuals born between 1959 and 1966 to death records through 2016. They found that suicide rates were higher for males, white people, and for those who were among the younger siblings in a family. Other risk factors included having a parent with less than a high school education, having a parent who worked a manual labor job, and having a mother with a high rate of pregnancy complications or who smoked during pregnancy.

Read about NICHD’s research findings and activities from 2021.

Sleep-disordered breathing in early pregnancy is associated with insulin resistance or difficulty clearing glucose from the blood, suggests a small study funded by the National Institutes of Health. The results strengthen the link between sleep-disordered breathing, which includes pauses or slowing of breathing during sleep, and gestational diabetes. They also suggest that screening pregnant women, particularly those with overweight or obesity, for sleep-disordered breathing could identify those who might benefit from early interventions to reduce their diabetes risk.

Pregnant women with disabilities have a much higher risk for severe pregnancy- and birth-related complications and death than other pregnant women, according to findings by researchers at the National Institutes of Health. Appearing in JAMA Network Open, the analysis of more than 223,000 deliveries in 19 U.S. hospitals found that roughly 2,199 women had a disability.