Bojan Fatur | E+ | Getty Images
Within weeks of giving birth, first-time mother Kyra Davis realized she was producing more milk than her baby needed.
So she began storing it in her fridge and freezer at her San Francisco home.
Davis had heard about the well-documented shortages at donor banks across the country. The problem is particularly acute for parents of sick or premature infants, who may not be able to digest formula as well as human milk.
So to find parents who wanted it, Davis joined several private groups on Facebook that are dedicated to human breast milk exchange.
Some of these Facebook groups are closed, meaning that outsiders can view them but cannot join without approval, such as Human Milk For Babies, a group that has more than two thousand members and promotes donation rather than sales of milk, and Buy, Sell, and Donate Breast Milk, with more than 5,000 members. Others are open pages, like the Human Milk 4 Human Babies Global Network, which has more than 80,000…