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In two weeks, I’ll bundle my daughter into her snowsuit and trek over to the pediatrician’s office, where a harried nurse in cartoon-print scrubs will stick my wailing child with her second flu shot.

For years, the Centers for Disease Control and Prevention has recommended that all kids older than 6 months get a seasonal flu shot. But on Monday, the CDC scrapped that long-standing guidance as part of an unprecedented overhaul of its vaccine recommendations — much to the horror of kids’ health experts and the confusion of parents.

The sudden slashing of the pediatric vaccine schedule is just one of several new or expected changes to federal health policy that will affect the lives of millions of Americans, many of them kids. In addition to the hullabaloo over shots, the Trump administration also amplified its baseless war on Tylenol this week and introduced nutrition limits in the food-stamp program.

To make sense of all these changes, I asked my colleague Dylan Scott — occasional host of this newsletter and health care reporter extraordinaire — to run through the Trump administration’s new health policies and how they affect Americans. (Dylan is also on the brink of launching Good Medicine, a new weekly newsletter for anyone trying to make sense of their health.)

There are five major pillars to watch, he said.

1) Pediatric vaccines

On Monday,........

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