(REUTERS) — Most of the breast milk sold over the Internet is contaminated with bacteria, a new study suggests.

Researchers tested 101 milk samples they bought on milk sharing websites. They found that almost three quarters probably weren’t safe for babies, especially preemies.

Those sites have thousands of ads from people selling breast milk, often new mothers who make more than their baby needs. The milk typically sells for $1 or $2 per ounce.

“If you buy milk on the Internet, you have no idea what you’re getting,” said Sarah Keim. She led the study at The Research Institute at Nationwide Children’s Hospital in Columbus, Ohio.

  • Text smaller
  • Text bigger
Note: Read our discussion guidelines before commenting.