Children born after oocyte donation have a higher risk of preterm birth and low birth weight than after standard in vitro fertilization, mainly due to the risk of preeclampsia.
Inflammatory events are involved in the pathogenesis of endometriosis and preterm birth, and a clinical correlation is suggested.
Endometriosis increases the risk of several pregnancy complications; some are caused by ectopic lesions, whereas others may reflect the impact of an adverse uterine environment on placenta formation.
Ovarian stimulation before conception is associated with significant elevations in first-trimester testosterone. Further studies are needed to evaluate the effect of early pregnancy testosterone on outcomes.
Overweight significantly increases the risk of very early preterm and very preterm births in twins conceived by IVF.
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