President Trump has a new health warning. Pregnant women with pain or fever should just tough it out with no medication to help, except in extreme circumstances.

According to the president and Health Secretary Robert F. Kennedy Jr., who is not a doctor, taking Tylenol during pregnancy can cause autism. Some studies have raised questions about acetaminophen, but most medical experts have said the evidence is far from clear. The FDA had said for decades that Tylenol is safer during pregnancy than aspirin or ibuprofen.

But when the president says it, it creates health policy. So here we are. And it raises a question: How do you actually bring down autism rates?

Here’s the thing: Rates look higher today because we test more, screen more, and understand more. Researchers now recognize autism

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