You may be well aware that your baby recognizes your face, but a new study has revealed that the toddler can also recognize the way you smile or frown.

Researchers at the University of London have found that babies as young as four months are able to recognise emotions in faces of people - in fact, they are able to pick up on "non-verbal" signals adults use to communicate before they start talking.

According to them, infants use the same brain regions that adults do when they look at the gaze of another, a base for social interactions that often appears critical for social development.