In young mammals, including humans, infant distress caused by either internal states (such as hunger) or separation from the mother is associated with a reduction in

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Opioids are naturally produced chemicals in the brain that are released in response to stress or pain. They act as natural painkillers and mood enhancers. Infants experiencing distress release opioids, which help reduce their feelings of distress and promote a sense of calm and well-being.

In Young Mammals, Including Humans, Infant Distress Caused by Either