A baby’s smile doesn’t just warm a mother’s heart? -? it gives her a natural high, scientists say.

An intriguing new study has shown that infant smiles light up the ‘feel-good’ parts of the brain that also respond to drugs and drink. The findings shed light on the unique mother-baby bond and help explain why the sight of a smiling infant can be such a tonic for sleep-deprived and stressed parents. Read more