|A baby's smile not only brightens a mother's day, but triggers a response in the brain that leads to a natural high, according to new research.
Scientists have found that first-time mothers display the brain activity associated with reward when they see their new babies smile.
A study of 28 new mums by Texas Children's Hospital found that the reaction in the brain depended on the expression on the babies' faces.
Mothers were shown images of babies aged between five and ten months, with the highest level of brain activity noted when participants were shown pictures of their own smiling child.
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