Breastfeeding and chestfeeding describe the same physical act: feeding an infant milk produced by the body’s mammary tissue. The difference is not medical or nutritional. It’s about language and who feels represented by each term. “Chestfeeding” emerged as an alternative for transgender men, non-binary parents, and others for whom the word “breast” doesn’t align with their gender identity.
Same Biology, Different Language
Both terms refer to the process of a baby latching onto the nipple and areola to drink human milk. The anatomy involved is identical: mammary glands respond to hormonal signals during and after pregnancy, producing colostrum and then mature milk. The nutritional composition of the milk, the mechanics of the latch, and the health benefits for parent and baby are the same regardless of which word someone uses.
The Academy of Breastfeeding Medicine lists both “breastfeeding” and “chestfeeding” as gender-inclusive terms alongside “lactating,” “expressing,” “pumping,” and “human milk feeding.” The ABM notes that “breastfeeding” implies a physical and emotional connection between parent and baby, while “lactating” is a more clinical term that doesn’t carry the same connotation. The word “chest,” however, has a different anatomical meaning and isn’t typically used in medical documentation. In practice, healthcare providers often ask patients which term they prefer and use that in conversation while defaulting to clinical language like “lactation” in charts.
Why the Term “Chestfeeding” Exists
For many people, “breastfeeding” is a perfectly comfortable word. But for transgender men, non-binary individuals, and some others, referring to “breasts” can trigger or intensify gender dysphoria, a deep discomfort with physical characteristics or language that conflicts with their gender identity. Using “chestfeeding” allows these parents to talk about feeding their babies without language that feels misaligned with who they are.
This isn’t just about preference. Trevor MacDonald, a transgender father and former La Leche League leader in Canada, has written that some trans people experience severe dysphoria when nursing and may choose not to do it at all for mental health reasons. Those who do nurse often find that affirming language from partners, family, and healthcare providers makes the experience more sustainable. La Leche League International now explicitly acknowledges that trans men, trans women, and non-binary individuals may choose to breastfeed or chestfeed, and the organization offers resources for all of these parents.
Lactation After Chest Surgery
One area where chestfeeding involves distinct practical considerations is when a transmasculine parent has had chest masculinization surgery (commonly called top surgery). This procedure removes mammary tissue and reshapes the chest to create a flatter, more masculine contour. However, surgeons typically do not remove all mammary tissue, because doing so would leave a sunken appearance. That remaining tissue means some milk production is still possible, though the amount varies widely depending on how much glandular tissue remains, whether milk ducts were severed, and how nerve sensation has recovered.
Parents who have had top surgery and want to chestfeed often need specialized lactation support. Strategies can include frequent pumping to stimulate whatever tissue remains, supplemental feeding systems that deliver donor milk or formula through a tube at the nipple, or a combination of both. Some parents produce enough milk to partially feed their babies; others find that the supply is too limited and switch to other feeding methods. Healthcare providers familiar with post-surgical anatomy can help set realistic expectations early in pregnancy.
Testosterone and Milk Safety
Transmasculine parents who use testosterone therapy often pause it during pregnancy and lactation, but some resume while still nursing. A study evaluating maternal testosterone therapy during lactation found reassuring results: testosterone delivered by sublingual drops, vaginal cream, or subcutaneous pellet implant was absorbed into the parent’s bloodstream but was not measurably excreted into breast milk. Infant blood levels of testosterone remained very low during seven months of continuous therapy, and no adverse effects were observed in the infant.
That said, the research base is still small, and decisions about hormone therapy during lactation are best made individually. The key takeaway is that testosterone use does not automatically rule out feeding a baby human milk.
Induced Lactation for Non-Gestational Parents
Chestfeeding conversations sometimes overlap with induced lactation, where a parent who did not carry the pregnancy stimulates milk production. This applies to adoptive parents, partners in same-sex couples, and transgender women. Protocols for inducing lactation typically involve months of hormonal preparation followed by frequent pumping to build supply. Most parents who follow these protocols are able to produce a significant portion of their baby’s milk needs, though supplementation is common, especially in the early weeks.
Which Term Should You Use?
If you’re a new parent choosing language for yourself, use whatever feels right. “Breastfeeding” remains the most widely understood term and is used comfortably by the vast majority of nursing parents. “Chestfeeding” is equally valid and serves an important purpose for people whose identity doesn’t fit neatly into the assumptions baked into older terminology. Neither term changes the milk, the bond, or the biology. If you’re talking to or about someone else, the simplest approach is to mirror the language they use for themselves.