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Women with asthma are more likely than normal to gain weight during pregnancy and to retain weight 3 months after giving birth, suggests a National Institutes of Health study. On average, women with asthma gained 3.1 kg (just under 7 lbs) more after a full-term pregnancy than women without asthma. Among women with asthma, weight gain was greater with obesity. Weight gain was also greater with more severe asthma and with asthma triggered by exercise. The study authors suggest that their findings underscore the importance of pre-pregnancy counseling for women with asthma on the need to achieve and maintain a healthy body weight.

Opioid use among women trying to conceive may be associated with a lower chance of pregnancy, suggests a National Institutes of Health study. Moreover, opioid use in early pregnancy may be associated with a greater chance of pregnancy loss.

New tools estimate fetal growth percentiles and velocity, and they account for racial and ethnic variations.

Exposure to iodine used for medical procedures in a neonatal intensive care unit (NICU) may increase an infant’s risk for congenital hypothyroidism (loss of thyroid function), suggests a study by researchers at the National Institutes of Health and other institutions.

The earlier in pregnancy infants were born, the more likely they were to fail a screening test for developmental delay by age 3, according to a study by researchers at the National Institutes of Health and other institutions. Although infants born at 39 weeks, considered full term, had a lower risk than those born earlier, infants born at 40 and 41 weeks had even lower risks. The findings may have implications for elective induction—labor induced when there is no medical need—at 39 weeks.

Children born to women with polycystic ovary syndrome (PCOS) may be at higher risk for anxiety, attention-deficit/hyperactivity disorder (ADHD), and behavioral problems, compared to children whose mothers do not have the infertility disorder, according to National Institutes of Health researchers.

Maternal obesity may increase a child’s risk for attention-deficit hyperactivity disorder (ADHD), according to an analysis by NICHD researchers.

The longer a woman with gestational, or pregnancy-related, diabetes breastfeeds her infant, the lower her risk for developing type 2 diabetes later in life, suggests an analysis by researchers at the National Institutes of Health and other institutions.

Women who go on to develop type 2 diabetes after having gestational, or pregnancy-related, diabetes are more likely to have particular genetic profiles, suggests an analysis by researchers at the National Institutes of Health and other institutions. The findings provide insight into the genetic factors underlying the risk of type 2 diabetes and may inform strategies for reducing this risk among women who had gestational diabetes.

Gene modifications correspond to blood pressure increases at distinct pregnancy intervals.

Dietary supplements containing zinc and folic acid—marketed as a treatment for male infertility—do not appear to improve pregnancy rates, sperm counts or sperm function, according to a study conducted by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), part of the National Institutes of Health.

Pregnant women exposed to persistent organic pollutants, or POPs, had slightly smaller fetuses than women who haven’t been exposed to these chemicals, according to an analysis of ultrasound scans by researchers at the National Institutes of Health and other institutions.

NICHD’s new initiative—Pregnancy for Every Body—educates plus-size pregnant women about healthy pregnancy and the importance of working with a healthcare provider to develop a pregnancy plan.

Children’s average daily time spent watching television or using a computer or mobile device increased from 53 minutes at age 12 months to more than 150 minutes at 3 years, according to an analysis by researchers at the National Institutes of Health and other institutions.

Among Asian/Pacific Islander women living in the United States, those who reside in ethnic enclaves—areas with a high concentration of residents of a similar ancestry—are less likely to have pregnancy or birth complications than those living in other areas, suggests a study by researchers at the National Institutes of Health and other institutions.

Feeling stressed was linked to lower chances of ovulation, conception, and pregnancy among women who had earlier experienced a pregnancy loss, according to an analysis by researchers at the NICHD.

Blood levels of omega-6 fatty acids produced in the body could influence the likelihood of developing gestational diabetes, suggests a study by researchers at the National Institutes of Health and other institutions. However, the researchers found no association with gestational diabetes from consuming foods containing omega-6 fatty acids, such as vegetable oils, nuts, and seeds.

Pregnant women who are exposed to higher air pollution levels during their second pregnancy, compared to their first one, may be at greater risk of preterm birth, according to researchers at the National Institutes of Health.

Exposure to high levels of certain common air pollutants in early pregnancy may increase the risk of pregnancy-induced high blood pressure, suggests an analysis by researchers at the Eunice Kennedy Shriver National Institute of Child Health and Human Development. In addition, exposure to a class of air pollutants known as volatile organic compounds in mid-pregnancy may increase the risk for preeclampsia, a potentially fatal disorder of pregnancy affecting blood pressure and kidney function.