Hope Green has two children in school, she told ABC News "the last thing they need is the school to now step in. You're too skinny, you're too fat," she said.

But parents are afraid the letters will put more pressure on kids, many of which are already preoccupied with their body image.

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Thousands of "No Kings" protesters marched down Courtland Street from the Atlanta Civic Center to Liberty Plaza on Saturday. (Abbey Cutrer/AJC)

Credit: Abbey Cutrer