Infants who breastfeed are smarter, faster and stronger, according to a new study.
The research found babies brought up on formula milk performed worse in mathematics, memory, IQ, and motor function tests at the age of seven compared to their breast-fed peers.
They also had a smaller volume of grey matter in their brains, an area important for processing and transmitting neural signals to other parts of the brain.
New mothers are advised to breastfeed for the first six months to protect their babies against infections and allergies.
But more than 70 per cent of mothers in America stop early.