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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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools