I don’t accept that “it’s a trial” somehow solves the ethical problem.
An 11-year-old cannot meaningfully consent to having normal puberty medically interrupted. Calling it “assent” does not change that. And parental consent is not a magic wand either. Parents cannot properly consent on a child’s behalf to an intervention where the purpose, benefit and endpoint are so unclear.
What is the drug actually trying to do here?
If the answer is “give the child time to think”, that has not been shown to be a neutral pause. Puberty is not just cosmetic. It is a major developmental process involving bones, brain, sexual development, fertility, emotional maturation and future adult function.
If the answer is “reduce distress”, then how is success being measured? Reduced distress after stopping puberty? Reduced distress after moving on to cross-sex hormones? Reduced distress years later as an adult? Because those are very different things.
And if the real pathway is blockers followed by cross-sex hormones, then this is not just a temporary delay. It is the beginning of a medical pathway that can lead to infertility, loss of normal sexual function and lifelong dependence on hormones.
The obvious first-line response to a distressed child should be whole-child mental health support: careful, neutral, exploratory, developmentally informed care that looks at autism, anxiety, trauma, family dynamics, sexuality, body image, social contagion and ordinary adolescent distress. Not telling a child that they may somehow be the opposite sex and then using drugs to stop their body developing normally.
Research is important, but not all research is automatically ethical just because it is monitored. You still need a coherent therapeutic aim, a plausible benefit, meaningful consent and an acceptable risk-benefit balance.
I don’t see that here. I see children too young to understand the lifelong stakes being placed on a pathway whose best-case “success” is unclear and whose foreseeable harms are enormous.