Who has the most breast milk?

The Woman with the Most Breast Milk Ever Donated

When it comes to extraordinary acts of generosity, few stand out quite like that of Elisabeth Anderson Sierra. Born around 1988, this American mother made medical history not through a scientific breakthrough, but through sheer dedication and the quiet power of motherhood.

Sierra holds the Guinness World Record for the largest individual donation of breast milk—a staggering 8,697 ounces, collected over several years. That’s over 67 gallons, enough to feed dozens of premature and vulnerable infants. Her journey began after the birth of her first child, when she realized she was producing more milk than her baby needed. Instead of letting it go to waste, she chose to donate it to milk banks, helping babies who couldn’t nurse from their own mothers due to illness or medical complications.

What sets Sierra apart isn’t just volume—it’s consistency. She maintained her donations through multiple pregnancies, pumping around the clock and adhering to strict hygiene and health standards required by milk banks. Her selflessness highlights the vital role donor milk plays in neonatal intensive care units, where it can mean the difference between life and death for premature babies.

Breast milk is more than nutrition—it’s packed with antibodies and enzymes crucial for infant development, especially in the first weeks of life. While formula exists, it can’t fully replicate the biological complexity of human milk. That’s why donors like Sierra are so invaluable.

Her story isn’t about fame. It’s about quiet resilience and compassion. In a world often focused on individual achievement, Sierra’s record reminds us that some of the most powerful contributions are made in silence, one ounce at a time.