The study also found that the depressed mothers had much higher levels of the stress hormone corticotrophin-releasing hormone (CRH), which is known to initiate birth. CRH is also naturally secreted by the placenta during pregnancy.
When the researchers checked the women s babies eight weeks after birth, they found that the babies born to mothers who were depressed during pregnancy had elevated levels of another stress hormone called cortisol, BBC News reported.
Experts noted that depression is common during pregnancy and that a possible link between depression during pregnancy and early birth needs to be examined in a larger study.
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