Pregnancy and Birth

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In anovulatory women with polycystic ovary syndrome (PCOS), one-time use of progestin to induce withdrawal bleeding before ovulation induction may decrease the odds of conception and live birth, according to a new study conducted by researchers for the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NIHCD) Cooperative Reproductive Medicine Network (RMN).

The use of the anti-HIV drug tenofovir during pregnancy does not affect birth weight or birth length, according to new research conducted as part of the Pediatric HIV/AIDS Cohort Study. The impetus for this study was that previous research in laboratory animals showed that exposure to tenofovir in the womb was associated with smaller birth size compared with animals not exposed to the drug.

Dietary and lifestyle interventions in pregnancy can reduce maternal gestational weight gain and improve outcomes for both mother and baby, according to a new study. In Europe and the United States, 20% to 40% of women gain more than the recommended amount of weight during pregnancy.

A new enzyme-linked immunosorbent assay, which was developed by scientists at the National Institute of Allergy and Infectious Diseases, was used to distinguish specific types of Toxoplasma gondii parasite that children acquired in the womb from their acutely infected mothers.

Typically used for long-term contraception, the intrauterine device (IUD) is also an effective emergency contraceptive if implanted after unprotected sex. Two IUDs, which are T-shaped pieces of plastic, are available in the United States.

Two studies focusing on birth defects and fertility treatment techniques recently have been published. The finding of both studies show that certain fertility treatments are associated with increased risks of birth defects, but neither study revealed why this association occurs.