A new long-term study has found that babies who breastfeed for longer have a better chance of scoring a higher IQ as adults.
The study found that compared to babies who were breastfed for less than a month, babies who were breastfed for a year or longer scored four IQ points higher on average on tests.
The study, conducted by Professor Cesar G Victora and published in The Lancet Global Health, used a sample of 3,500 babies from different backgrounds and social classes.
Victora, from the Federal University of Pelotas in Brazil, and his colleagues found that breastfeeding might have "long-term effects on intelligence in a population without strong social patterning of breastfeeding".