Old assumptions about human breast milk are giving way to new thinking about microbes in milk and their role in children’s health and our immune systems.
It happened again, most recently at a conference in Prague. After she gave her talk, a scientist came up to Shelley McGuire, a pioneer exploring the microbial communities found in human breast milk, and told her, You don’t know how to take a sample. Your samples must have been contaminated. Human milk is sterile.