Surgery on intersex infants attempts to shape them to society’s expectations. It is society, not the child, that needs changing. A wave of anti-trans bills and regulation in the United States are not only constructing sex as rigidly binary and immutable, they are constructing exemptions that explicitly permit surgical interventions to change the sex characteristics of children whose bodies don’t fit strict norms for female or male. The bodies of intersex people – born with sex characteristics that challenge ideas of how female and male bodies should look and function – are profoundly stigmatised in our societies. Medicine takes for granted the idea that people with intersex traits must be shaped to fit social expectations. But this is often a medical solution to a social problem, not a problem in the person. The intersex movement calls for acceptance of bodily diversity and, like the trans movement and the pro-choice movement, respect for bodily autonomy and freedom from coercive practices. Intersex variations, or innate variations of sex characteristics, include a wide range of traits affecting chromosomes, sexual anatomy or hormones. They’re also referred to as “differences of sex development” in sporting regulations, or “disorders of sex development” in medicine. In some regions of the world, being born visibly different can place a newborn at risk of infanticide. In many regions, prenatal evidence of an intersex trait can lead to termination of pregnancies, while assisted reproductive technologies are at times encouraged to avoid the birth of a child with intersex variations. Wherever medical intervention is accessible, infants, children and adolescents with intersex traits can be subject to early surgeries and hormonal treatment aimed at changing appearance or function to make their bodies more closely fit social and cultural norms for female and male bodies. They can be subject to sterilisation, clitoral reduction, labioplasties, phalloplasties, and related genital surgeries and hormone treatments without their informed consent. Doctors typically observe an infant’s sex at birth, or even before birth, resulting in legal classification of sex, and influencing decisions about how a child is treated. When an intersex variation is evident, it can raise questions about how a child should be assigned and treated. Doctors consider ‘surgical options’ to be an acceptable factor in the decision, alongside other factors such as assessment of likely future gender identity. While each intersex trait is associated with some data on more or less likely future gender identity, these factors are subjective and never entirely knowable. In one Australian legal case, a preschool child was described by a judge as having had surgery that “enhanced the appearance of her female genitalia”. Children with her characteristics are subjected to either masculinising or feminising surgeries, and sterilised when assigned female. Her sterilisation was justified by the judge in this case through reference to her conformity to female stereotypes such as having her “long blond hair tied in braids”. Reports from one paediatric and adolescent gynaecology clinic show that all girls with relevant intersex traits underwent sterilisation, with many undergoing early surgeries that would otherwise be illegal when performed on non-intersex girls, prohibited as forms of female genital mutilation. Boys who may not be able to urinate standing up may undergo multiple surgeries to ensure they are able to urinate “appropriately”. But evidence is lacking that these kinds of life-altering clinical interventions are necessary. Clinical claims of reduced risk of stigmatisation, improved bonding between parents and their child, or certainty about future gender identity are evidence-free. Sometimes treatments are necessary to ensure physical health and well-being, and removal of reproductive organs may be needed because of a higher risk of cancer (although cancer evidence is patchy because of the prevalence of early sterilisations). It is challenging for parents to disentangle medical interventions for genuine physical necessity from those grounded in subjective gender stereotypes. Many early surgeries can cause lifelong harm, leading to shame, impaired sexual function and sensation, and a need for more surgeries or ongoing hormonal treatment. These surgeries are also poor substitutes for psychological and social support for individuals and their families. This is often lacking or unresourced. The intersex movement has challenged unnecessary surgeries since the 1990s, calling on clinicians to wait wherever possible until individuals can make their own informed choices about medical treatment. Children can be assigned a sex without surgery.