If you worry about sex development, please look at environmental inputs

Climate change and pollution affects the sex of sea turtles.

"Green sea turtles are producing more females in response to a warming climate — and human-caused pollution is helping fuel the surge, a recent analysis suggests.

Writing in Frontiers in Marine Science, researchers say ocean contaminants are contributing to a surge of female green sea turtles.

Like many other reptiles, sea turtles’ sex development is influenced by the temperature of their nests. Green sea turtles incubate in large clutches of eggs their migratory mothers bury in the sand on nesting beaches. Over the course of about two months, they develop from embryos into tiny turtles, with warmer sands producing more females and cooler sands producing more males.

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Turtles born with higher concentrations of ... metals such as chromium, lead and cadmium and industrial byproducts like polychlorinated biphenyls (PCBs) — were likelier to be female."

— Pollution fueling a sex imbalance among endangered green sea turtles (subscriber gift link). Erin Blakemore. Washington Post. November 26, 2023.

Many people who claim to be "concerned" about the sex development of children are working to make transgender life illegal, inaccessible, or generally unworkable or untenable. If they are truly concerned about children's bodies, and if they think of themselves as so grounded in "biology" and "reality," they should think more about climate change and pollution. That would be good work they could do.

Or they could think about other environmental inputs and health effects, like:
New Cancer Cases Are Expected to Pass 2 Million This Year. What Does That Mean for All of Us?: An American Cancer Society report predicts a record-breaking number of cases in the US. BU oncologist Naomi Y. Ko discusses why cases are going up, particularly among younger people, and how to reduce your cancer risk. Alene Bouranova. Boston University. January 30, 2024.

What affects sea turtles could indicate something that might affect humans too.

This book argues that chemical exposures affect sperm counts: Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race. Shanna H. Swan. Simon & Schuster, 2021.

Oh, and by the way: "On the podcast this week [March 2024], we talk about how hackers are exploiting electronic prescription systems to order mountains of drugs..." (404 Media) if you're worried about exploitation of prescription drugs, you should be worried about large-scale fraud, theft, and addiction — not a trans kid.

"Toxic plastic chemicals number in the thousands, most are unregulated, report finds," Sandee LaMotte, CNN, March 14, 2024

"Sex is real. So is global warming. To believe in their reality is an indispensable precondition for making normative claims about them... the belief that we have a moral duty to accept reality just because it is real is, I think, a fine definition of nihilism. ...[This right comes] from a broader ideal of biological justice, from which there also flows the right to abortion, the right to nutritious food and clean water, and, crucially, the right to health care." — Andrea Long Chu, "Freedom of Sex: The moral case for letting trans kids change their bodies," New York Intelligencer, March 11, 2024

"Why do we trust the scientists who predict eclipses but doubt those who warn us about climate change? ... Perhaps the answer lies not in the science but in ourselves. Embracing the full spectrum of scientific discoveries requires intellectual acceptance and emotional and practical engagement. It demands that we move beyond viewing science as a series of disconnected events and see it as a narrative of life history—a narrative that we are not merely observing but actively shaping." — The Paradox of Selective Scientific Trust, Dr. Pine, The New Climate, April 18, 2024

If you're skipping over this article about the effect that environmental inputs like pollution have on children's sex development, maybe you're not really worried about children's sex development after all. Maybe you're just worried about trans people existing.