Breast milk banks see surge in demand amid baby formula shortage

Milk banks across the country are collecting donated breast milk from lactating women and distributing it to babies struggling amid a national shortage of baby formula that experts are calling a "crisis."

If you've never heard of a mothers' milk bank, you're not alone. 

"It's my impression that it's very difficult to explain who we are and what we do," said Dr. Susan B. Campbell, executive director of the Mothers' Milk Bank of Tennessee.