A large number of babies receive the purchased breast milk due to medical conditions, the study published in the journal Pediatrics said."We found that one in every 10 samples of breast milk purchased over the internet had significant amount of cow's milk added, and this poses a risk to infants with an allergy or intolerance to cow's milk," said principal investigator Sarah Keim from

Researchers believe that because money is exchanged in these transactions, there might be an incentive to boost milk volumes in order to make more money."Cow's milk and infant formula resemble human milk and could potentially be added to boost volumes without the recipient knowing," Keim said.

For the study, the researchers purchased and tested 102 samples of breast milk advertised on milk-sharing websites.All purchased samples did contain human milk, but 11 also contained bovine DNA, 10 of which had results consistent with more than minor, accidental contamination with cow's milk.

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