The authors of the current study note that many of these earlier studies included a small number of women. Researchers have hypothesized that, with these sleep positions, the increasing weight of the uterus during pregnancy could compress the aorta (the central artery conveying blood to the upper and lower abdomen) and the inferior vena cava (the central vein returning blood from the lower abdomen to the heart). Previous studies have linked back and right-side sleeping with a higher risk of stillbirth, reduced fetal growth, low birth weight, and preeclampsia, a life-threatening high blood pressure disorder that affects the mother. Many physicians advise pregnant women to sleep on their left side. The researchers cautioned that their study evaluated sleep position only up to 30 weeks of pregnancy and does not provide information on whether back or right-side sleeping in late pregnancy could increase the risk of birth or pregnancy complications. The findings may help to allay concerns-informed by previous studies-that sleeping on the back or right side may compress blood vessels supplying the uterus and potentially harm the fetus or the mother. Silver, M.D., of the University of Utah School of Medicine and colleagues. Sleeping on the back or side through the 30th week of pregnancy does not appear to increase the risk of stillbirth, reduced size at birth, or high blood pressure disorders of pregnancy, suggests an analysis funded by NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD).
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