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In the study of 1177 mother-infant pairs, a third of the children were exclusively breastfed until the age of three months. By the age of six years, 20.8% of children had been diagnosed with respiratory allergies and 11.3% with asthma.
Exclusive breastfeeding for three months was associated with a 23% lower relative risk of respiratory allergies at the age of six years. It was also associated with a 34% lower relative risk of asthma, but only if the children did not have a family history of asthma.
Breastfeeding for three months, but not exclusively, was insufficient to reduce the risk of respiratory allergies or asthma.
“Airway disorders such as respiratory allergies and some asthma may be prevented in some cases by encouraging exclusive breastfeeding for at least three months, as human milk was potentially beneficial in reducing the risk of airway disorders among children,” said author Galya Bigman, PhD, of the University of Maryland, Institute of Human Virology, School of Medicine.