Moms-to-be who undergo physical or mental stress during their pregnancies are less likely to have a boy and may also have a higher risk of preterm birth, according to a study published Monday.
"The womb is an influential first home," said lead author Catherine Monk, director of women's mental health in OB/GYN at NewYork-Presbyterian/Columbia University Irving Medical Center. "We do know that males are more vulnerable in utero, and presumably the stress in these women is of a long-standing nature," Monk said.
While this study did not explore just how stress might impact the pregnancy, others have pointed to the role of the stress hormone cortisol. Cortisol is part of the body's"flight or flight" alarm system and is meant to dissipate once the danger is over. Chronically high levels can increase blood pressure and make an individual more prone to illness.
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