Chestfeeding is the act of feeding a baby milk from your chest. It means the same thing as breastfeeding, but uses gender-neutral language that better fits the identity of transgender, nonbinary, and gender-diverse parents. The term is used most often by masculine-identified trans people, though anyone can use it.
Why the Term Exists
For many people, “breastfeeding” works just fine. But for transgender men and nonbinary parents, the word “breast” can trigger real discomfort tied to gender dysphoria, the distress that comes from a mismatch between your body and your gender identity. Using “chestfeeding” instead removes that friction and lets the focus stay on feeding the baby.
The Academy of Breastfeeding Medicine formally defines chestfeeding as “a term used by many masculine-identified trans people to describe the act of feeding their baby from their chest, regardless of whether they have had chest/top surgery.” Their clinical guidelines recommend that healthcare providers ask each patient which words they prefer for feeding, parenting, and their own body, rather than assuming one term fits everyone. Misgendering a patient or defaulting to terms they haven’t chosen is recognized as harmful to care.
How Chestfeeding Works Physically
The mechanics are the same as breastfeeding. Mammary tissue produces milk in response to hormonal signals during and after pregnancy, and the baby draws milk out through the nipple. If a trans or nonbinary parent has gone through pregnancy and birth without prior chest surgery or hormone therapy, their body typically produces milk the same way any postpartum body would.
Things get more complex when hormone therapy or surgery is part of someone’s history. High doses of testosterone can suppress lactation, and some parents pause testosterone during pregnancy and the feeding period. Others resume it after birth. For parents who haven’t been pregnant but want to produce milk, induced lactation is possible. Published case reports describe successful protocols where, within about four weeks of a modified hormone regimen combined with a medication that promotes milk production, patients began lactating spontaneously. These cases are still rare, with only a handful documented in the medical literature so far.
Chestfeeding After Top Surgery
Whether someone can chestfeed after gender-affirming chest surgery depends heavily on the surgical technique used. The most common approach for chest masculinization is a double incision mastectomy with free nipple grafts, where the nipple and areola are fully separated from the underlying tissue, removed, and grafted back onto the chest in a new position. This severs the milk ducts entirely, making milk removal through the nipple essentially impossible, even if some glandular tissue remains underneath.
Less extensive procedures, similar to breast reduction techniques where the nipple stays connected to the tissue beneath it, may preserve some capacity for milk production and removal. But nipple reduction, a common add-on to masculinizing surgery, often eliminates the functional openings milk flows through. The bottom line: parents considering future chestfeeding should discuss it with their surgeon beforehand, because many people report that the impact on feeding was never mentioned during their surgical consultations.
Supplemental Feeding Tools
When milk supply is limited, whether from surgery, hormone therapy, or any other reason, a device called a supplemental nursing system can bridge the gap. It’s a small container of formula or donor milk worn around the neck or over the shoulder, connected to a thin tube that’s taped along the chest so the tip sits right at the nipple. The baby latches and drinks from the tube and the chest simultaneously, which maintains the bonding and skin-to-skin experience of feeding at the chest while ensuring the baby gets enough nutrition.
Two main commercial versions exist: the Medela Supplemental Nursing System, which uses a bottle with interchangeable tube sizes, and the Lact-Aid, which uses disposable bags. Parents who use these regularly often keep a spare pre-filled in the fridge so they’re not scrambling mid-feed. With a cool bag and ice packs, these systems are portable enough for a full day out of the house. As the baby starts eating solid foods, the number of supplemented feeds typically drops, making the logistics simpler over time.
Safety of Milk During Testosterone Therapy
One of the most common questions from trans parents is whether resuming testosterone makes their milk unsafe. The available data, while still limited, is reassuring. Testosterone has low oral bioavailability, meaning that even when it shows up in milk, a baby’s digestive system breaks most of it down before it reaches the bloodstream.
In one tracked case, a trans man began weekly testosterone injections about 14 months after giving birth and continued chestfeeding. Milk testosterone levels did rise over the following months, reaching about 359 nanograms per liter by day 134. But the calculated dose the infant would actually absorb was just 0.041% of the parent’s dose. The infant’s blood testosterone levels remained undetectable throughout the entire monitoring period. In another case, a trans parent’s chestfed infant had normal testosterone levels at 21 months, six months after the parent started standard hormone therapy. No adverse effects were noted in any of the documented cases. That said, high-dose testosterone can reduce milk supply itself, which is a practical consideration separate from safety.
Barriers in Healthcare Settings
Trans and nonbinary parents consistently report that medical settings are not set up for them. Maternity wards, lactation clinics, and early parenting services tend to be built around the assumption that every birthing and feeding parent is a cisgender woman. Clinic names include words like “maternal” or “moms.” Intake forms offer only “mother” and “father.” Staff may not know a patient’s pronouns or may use the wrong ones repeatedly.
The practical consequences go beyond discomfort. Research from the UK found that trans parents were more likely to say they received no support or encouragement from midwifery or health visiting teams. In one documented case, a transgender parent in Canada was left to teach himself about feeding his own child because healthcare providers simply assumed he would use formula and handed him samples without discussion. Parents who did chestfeed described the experience as emotionally and physically challenging, but were strongly motivated by the health benefits of their milk for their baby.
Medical organizations are starting to respond. Updated guidelines from bodies like the Academy of Breastfeeding Medicine and the UK’s National Institute for Health and Care Excellence now call for person-centered language, provider training on gender-diverse family structures, and clinic environments that don’t default to gendered terminology. Practical recommendations include providers sharing their own pronouns during introductions, using open-ended questions like “What are your thoughts about feeding your child?” instead of making assumptions, and asking each patient which terms they’d like used throughout their care.