In the decades since, research by my group and others has confirmed that adverse experiences may influence the next generation through multiple pathways. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today. If you're enjoying this article, consider supporting our award-winning journalism by subscribing. Now it looked like trauma could leave a trace in offspring even before they are born. Just a year earlier a team I led had reported low cortisol levels in adult children of Holocaust survivors, but we'd assumed that it had something to do with being raised by parents who were suffering from the long-term emotional consequences of severe trauma. The effect was most prominent in babies whose mothers had been in their third trimester on that fateful day. Surprisingly and disturbingly, the saliva of the nine-month-old babies of the women with PTSD also showed low cortisol. And those with PTSD had unusually low levels of the stress-related hormone cortisol, a feature that researchers were coming to associate with the disorder. Psychological evaluations revealed that many of the mothers had developed PTSD. Nine months later we examined 38 women and their infants when they came in for a wellness visit. When the babies were born, they were smaller than usual-the first sign that the trauma of the World Trade Center attack had reached the womb. We monitored them through their pregnancies and beyond. My trauma research team quickly trained health professionals to evaluate and, if needed, treat the women. They were at risk of developing post-traumatic stress disorder, or PTSD-experiencing flashbacks, nightmares, emotional numbness or other psychiatric symptoms for years afterward. Many were in shock, and a colleague asked if I could help diagnose and monitor them. Among those who came in for evaluation were 187 pregnant women. After the twin towers of the World Trade Center collapsed on September 11, 2001, in a haze of horror and smoke, clinicians at the Icahn School of Medicine at Mount Sinai in Manhattan offered to check anyone who'd been in the area for exposure to toxins.
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