AITA for not wanting to “donate” my b**ast milk to my sister?

In a quiet nursery filled with the soft coos of a 4-month-old, a new mother diligently pumped breast milk, building a precious stockpile for her daughter’s future needs. Each bottle represented hours of effort, a labor of love to ensure her baby’s nourishment. But when her sister, a fellow new mom, strolled in and casually asked to take the milk for her own baby, the room grew tense. The sister’s choice to skip breastfeeding to preserve her appearance made the request feel like a bold overstep.

The mother’s firm “no” unleashed a family storm. Her sister, stunned by the refusal, rallied their parents to pressure her, turning a personal boundary into a full-blown family debate. The milk wasn’t just sustenance it was a symbol of her dedication. Protecting her daughter’s supply felt instinctual, but the backlash left her second-guessing.

‘AITA for not wanting to “donate” my b**ast milk to my sister?’

I’m a mother of a 4 month old baby girl. I breastfeed her exclusively, and have had a fairly good supply. Recently she has been unable to latch on my left b**ast, and I have been pumping that side, so I have a decent stockpile of milk. My sister also recently had a baby and decided against breastfeeding (which I support. Fed is best)

My issue arose when she came over one day and asked if she could take my b**ast milk. She decided formula was too expensive and she would just take my b**ast milk that I pump. I told her no, that I was saving that in case baby girl has issues latching again or if I’m not around and she needs to be fed.

My sister freaked out and told me I didn’t need that much and I could always pump more so giving her what I have pumped so far wouldn’t matter. We argued for a while and she got our parents involved. Now it’s become a whole family issue and the people who disagree have been blowing up my phone.. Am I being unreasonable?

A small edit before it gets much traction: my sister decided not to breastfeed because she did not want her boobs to sag. Not exactly the most relevant but I figured someone might ask that question

This breast milk battle is a stark reminder of how personal choices can spark family tension. The mother’s refusal to share her pumped milk was a stand for her daughter’s needs and her own bodily autonomy. Her sister’s demand, driven by a desire to avoid formula costs after choosing not to breastfeed for cosmetic reasons, ignores the physical and emotional toll of pumping. The family’s pressure only amplified the boundary violation, making the mother’s stance feel like a lone defense.

The issue touches on a broader topic: respecting bodily autonomy in motherhood. A 2022 study in the Journal of Human Lactation found that breastfeeding mothers often face external pressures that undermine their choices, impacting mental health. The sister’s entitlement to the milk disregards the mother’s effort and her right to prioritize her child, escalating a personal decision into a family conflict.

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Dr. Naomi Stadlen, a breastfeeding counselor, notes, “A mother’s milk is her own to give or withhold, just as any part of her body is”. Here, the sister’s assumption that the milk was up for grabs dismisses the mother’s labor and her daughter’s needs. The family’s involvement further complicates things, pressuring conformity over individual choice.

To navigate this, the mother could calmly explain her need to prioritize her daughter, suggesting her sister explore affordable formula options or community resources, like WIC programs. Family members could redirect their support to helping the sister financially rather than pressuring the mother. Open communication about boundaries can ease tensions, ensuring respect for all parties while keeping the focus on the babies’ well-being.

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Check out how the community responded:

Reddit users unanimously backed the mother, labeling her “NTA” (Not The Asshole). They called the sister’s request entitled, emphasizing that breast milk is a personal resource, not a family commodity. Many criticized the sister’s cosmetic reasoning and the family’s pressure as unreasonable.

The community’s verdict highlights a shared view that the mother’s milk is hers to control. They saw the sister’s demand and the family’s interference as oversteps, applauding the mother for protecting her daughter’s supply and her own boundaries.

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Thia-M − NTA. Rule of thumb #1. If someone goes whining to others to get them to harass you, they automatically become TA. Please tell all of those other people to mind their business.

rockabillyrosie − NTA. This is insane. Your sister can absolutely go buy formula. If she legitimately cannot afford formula she can ask for help and I would hope you and family members would help her by buying formula for her or helping her access resources, but her decision not to buy formula doesn’t entitle her to your b**ast milk in any way

itsjustanothergirl − NTA. So, she decided not to breastfeed, but feels entitled to your child's food? WTH?

CalgaryChris77 − NTA if she wanted to save on formula she should have b**ast fed.

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[Reddit User] − NTA Your sister should’ve researched her options better and known that formula costs and arm and a leg. That’s not your problem. You’re being super vigilant and smart making sure your daughter has a stock pile! Your sister is being very selfish taking that milk from your daughters mouth essentially.

And she’s not even taking into consideration that tears and dedication that went into pumping. It’s not easy. That’s YOUR milk, and the fact that she felt entitled to it disgusts me. And not breastfeeding because your boobs will sag is a stupid selfish excuse…news flash to your sister, your boobs will sag either way.😉

lianavan77 − NTA. It is your milk. Tell your family they can pump for her or stfu.

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callingrobin − NTA. You are UNBELIEVABLY NOT THE A-HOLE. Your sister clearly doesn’t understand how physically demanding and time-consuming it is to breastfeed and pump a supply. She has no right to the milk you’ve collected from your body for your own daughter.

I don’t understand how she thinks it’s okay to assume she can just make you supply enough for two babies. If she’s genuinely having issues with affording formula, family should help her out and/or she should switch to a cheaper formula. Walmart (at least in Canada) has really really good generics for like 14 - 16$ for a large container (~900g).

Anyone pressuring you to supply b**ast milk for her child should volunteer to hook their own tits to a pump 8-10 times a day and see how reasonable of a request that is. If her milk has already dried up and she wants to breastfeed

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she should purchase or rent a pump and get a prescription from her doctor to try and begin relactation. Warning though, it can take a month or more to get a supply back and sometimes it just doesn’t.

DepressionEraMomJean − NTA. She just wants to feed her child for free.

Peepsen − Rephrase it; your sister is saying she is more entitled to your spare bodily fluids than you are.. NTA and frankly wtf is wrong with your sister.

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Pumpkinkra − NTA  pumping is a lot of work! I’d be afraid you give her some and she decides it’s the only thing her baby will tolerate and so you should supply all the other baby wants indefinitely.

This milk-sharing saga underscores the delicate balance of family support and personal boundaries. The mother’s refusal to give up her breast milk was a stand for her daughter and herself, even if it stirred family drama. The resolution lies in respecting her choice while finding other ways to help her sister. How would you handle a family member demanding something so personal? Share your thoughts below!

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