The researchers found that the children are also more likely to earn a higher wage.
A new long-term study has found that babies who breastfeed for longer have a better chance of scoring a higher IQ as adults.
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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.
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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".
The researchers noted that babies who were breastfed for longer were also more likely to earn a higher wage and to be in education for a longer time.
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