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Breast-fed babies grow into better behaved and more emotionally stable children than those that are bottle fed.
According to a study, 5 year olds who had been breast fed were a third less likely to suffer behavioural problems severe enough to disrupt family life.
The Oxford University study found those brought up on bottled milk tended to display traits such as neediness, anxiety, hyperactivity or lying.
The study, involving 10,000 mothers and their babies says it may be because of the make-up of breast milk.
Last summer supermodel Gisele Bundchen said that by law mothers should breastfeed their children for at least six months.
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