(CNN) — Do you ever find yourself comparing the size of your child with those of their classmates and worrying about their health? Just as you shouldn’t judge a book by its cover, you can’t judge a person’s health solely by the way their body looks, said Jill Castle, a pediatric dietitian in Massachusetts. In her new book, “ Kids Thrive at Every Size ,” Castle aims to offer a new model for assessing and addressing kids’ health. Javascript is required for you to be able to read premium content.

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