Donating breast milk can feel deeply personal and it’s normal to have questions, hesitations, or even worries. We often receive calls from prospective donors who want to understand the impact of their donation on the community. Here at Mothers’ Milk Bank California, we welcome those conversations because this is your milk and it represents a great deal of care and effort.
An informed choice starts with understanding where your milk goes and how it’s used. We want to make sure you have clear, straightforward answers as you consider donating milk. Our goal is to help you feel confident in your decision and to understand the impact your gift can make and why it matters. Here are some of the questions people ask most when getting started.
“My freezer is full of breast milk. How long will the screening process take?”
Beyond the genuine desire to help a baby, freeing up freezer space can be an added benefit to donating milk. There are 5 steps to donating with Mothers’ Milk Bank California (MMBCA):
- Step 1: Complete an online pre-screening form and select a time for your phone interview. (Approximately 3-5 minutes)
- Step 2: A donor coordinator will call you at your selected time to ask you questions about your health and lifestyle habits. (Approx. 20 minutes)
- Step 3: You will receive a donor packet which includes about 50 yes or no questions about your medical history. (Approx. 20 minutes or more, depending on how quickly you answer the questions). Your donor packet will need to be verified by your physician to validate your responses. No need to worry, we’ll contact the physician for you.
- Step 4: Schedule a free blood test at your nearest blood diagnostic center at a time that works for you. (Results usually arrive within 2-5 days)
- Step 5: Once we receive your blood test results, you may become eligible to donate. From there, we can send you shipping bags, containers and pre-paid shipping labels at no cost to you. Simply place your milk in the storage container and a courier will come pick it up right from your doorstep! We can also provide replacement breast milk storage bags if needed.
All in all, the donor screening process can take close to 2 weeks (or longer for several reasons). Once you’re approved as a donor, you will receive a QR code fridge magnet that you can scan to request a cooler whenever you would like to donate. We aim to make screening as seamless as possible by assigning you a dedicated donor coordinator who will guide you through each step.
If you have not donated with MMBCA for 6 months or more, we may ask you to complete a 4 question illness and medication review and/or invite you to a 20-minute wellness check over the phone. You do not need to complete another donor packet or take another blood test unless you have had another baby.
“I don’t have a lot of extra milk but I want to donate.”
It’s very common to explore donations without having a large amount stored. Under the guidance of the Human Milk Banking Association of North America (HMBANA), milk banks set a minimum donation amount to ensure the process is both sustainable and efficient. Screening, pasteurization, and lab testing take time and resources, and milk naturally decreases in volume during processing due to evaporation and the small amounts needed for safety testing.
If you’re worried that you “don’t have enough,” ask the milk bank what their minimum is and what options are available. At MMBCA, we accept frozen breast milk for up to 9 months, which can give you time to build your supply gradually.
“Is informal milk sharing basically the same as donating through a milk bank?”
Not exactly. Both are rooted in generosity and the desire to support babies and families, but milk banking adds medical safeguards that informal sharing can’t reliably provide.
Informal sharing, especially through online community groups can carry risks that milk banks are specifically designed to reduce. These include:
- Transmission of infections (even from donors who feel healthy and have no symptoms)
- Exposure to medications, drugs or alcohol
- Contamination from storage or handling of the breast milk
Milk banks take several steps to protect medically fragile infants:
- Screening donors through health history and blood testing
- Pasteurizing milk in a controlled lab environment
- Testing each batch to confirm safety before distribution
Because of these safeguards, hospitals rely on accredited milk banks as a medically trusted source of donor human milk.
“Do milk banks sell donated milk?”
Milk banks charge a processing fee, but the fee does not reflect the value of the milk itself.
As a nonprofit milk bank, the processing fee helps cover the cost of safely preparing donated milk for medically fragile infants.
This work is mission-driven, highly regulated, and resource-intensive. The processing fee supports essential steps, including:
- Donor screening and blood testing
- Pasteurization in a controlled lab environment
- Microbiological testing to confirm safety
- Bottling, storage, and careful handling
- Distribution to hospitals and families
- Trained staff to manage each stage of the process
- Required state and federal compliance to ensure milk is handled safely and responsibly
Our mission is to advance health by providing safe donor human milk to vulnerable infants. The processing fee helps us uphold the highest safety standards so that every ounce entrusted to us is prepared with care and can make a meaningful difference for babies who need it most.
“Do milk donors get paid for their donation?”
Guided by HMBANA’s ethical framework around responsible sourcing, nonprofit milk banks do not pay donors. This approach helps ensure that parents feel free to prioritize feeding their own baby first and that the donation process remains transparent and rooted in informed choice. Payment can introduce pressures or incentives that may affect how openly someone shares health information during screening. By keeping donation voluntary and unpaid, milk banks support a culture of safety, honesty, and care for both donors and the babies who receive their milk.
“Is donor milk only for premature babies in the NICU?”
NICU babies are often the highest priority for milk banks, but donor milk is available to other families as well. After a milk bank fulfills hospital orders, remaining supply is offered to families with babies at home that need medical care. This also includes babies whose parent is ill or deceased, as well as families formed through adoption or surrogacy.
At Mothers’ Milk Bank California, we work to make donor human milk as accessible as possible; which is why donor recruitment matters. It’s not only for medically fragile infants, it is also the life-saving support for families who wouldn’t have access to the nutritional and protective components of human milk that help babies grow healthy.
Ready to take the next step?
If you’re considering donating, contact a nonprofit milk bank and ask about eligibility, minimum donation amounts, and the screening process. The goal is to make donating feel safe, supported, and doable.
Your milk can be someone else’s bridge—especially for babies who are fighting hard at the very beginning. At Mothers’ Milk Bank California, we make donating as seamless as possible. Call our donor services team at (408) 998 4550 ext 3 to start the donation process. Visit our website (“Become a Donor”) for more information on how to start.
