An Oregon mother found herself producing eight to ten times the normal amount of breast milk. Instead of letting the massive surplus go to waste, she decided to package it up and give it away.
Over the next decade, Elisabeth Anderson Sierra would pump and freeze thousands of liters of milk, eventually earning a Guinness World Record for the largest individual breast milk donation. This is the factual story of a rare medical diagnosis that transformed a mother of three into a worldwide supplier for infants in need.
A Rare Hyperlactation Syndrome Diagnosis
In 2014, doctors diagnosed Anderson Sierra with hyperlactation syndrome. Midway through her initial pregnancy, the Aloha, Oregon resident was already producing 20 US fluid ounces (0.59 liters) of milk per day. During her prenatal appointments, she reported these volume numbers to her medical team.
Her midwife and doctor mistakenly assumed she was measuring the liquid in milliliters. In reality, she was generating significantly more than the typical 45 milliliters (1.52 US fluid ounces) expected during that stage of pregnancy.
Producing Eight Times the Average Volume
Because of her condition, Anderson Sierra produces an average of 225 US fluid ounces (6.7 liters) of breast milk every single day. This daily output is nearly eight to ten times the volume produced by an average nursing mother. Rather than discarding this surplus, she chose to dedicate her time to milk sharing.
She pumps the liquid, packages it securely, and donates it to local families and recipients across the globe to supplement or replace standard infant formula.
Achieving a Guinness World Record
Her continuous pumping and sharing efforts eventually attracted international attention. In 2023, she officially secured the Guinness World Record for the largest individual breast milk donation. To set this record, she donated exactly 54,092 US fluid ounces (1,599.68 liters) to a human milk bank during a monitored period between February 20, 2015, and June 20, 2018.
Over the years, media outlets and online communities have given her nicknames like the “milk goddess,” the “super producer,” and the “pumping queen.”
Beyond the 10,000 Liter Milestone
The official world record only accounts for a fraction of her actual output. As of July 2023, her estimated lifetime donation of breast milk surpassed 350,000 US fluid ounces (10,350 liters).
Outside of her daily pumping routine, she works as a certified lactation counselor and serves as the director of lactation services for the breast pump company BabyBuddha. She actively states her goal to surpass her current world record and hopes that sharing her medical story will normalize the practice of donating breast milk.