The case of the shrinking two-year-old

This week I'm on talking about how we read growth charts: 

Around their second birthdays, four to eight percent of American children previously identified as healthy are classified as underweight. What affliction is overtaking these children? Growth charts.
Obviously, the growth charts themselves aren’t responsible for children’s ill health (and, in fact, most of those children aren’t in ill health). But our systems for measuring children, often understood differently by physicians and parents, affect how we define health.

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