You handed your toddler a lovely new book this morning, and by lunchtime a corner was in their mouth and a page was torn clean out. It's tempting to read this as a sign you've got a destructive kid on your hands, or that books are a lost cause for now. Neither is true.
The core finding: mouthing objects is normal and declining behavior, not misbehavior
A widely cited study by Daland Juberg, Kim Alfano, Rochelle Coughlin and Kristina Thompson, published in Pediatrics in 2001, had parents keep detailed diaries of exactly how long their children spent mouthing different objects. Children under 18 months spent far more time mouthing non-toy objects — books very much included — than children between 19 and 36 months did. The behavior wasn't random or constant either: some children barely mouthed objects at all, and almost none did it for more than two hours a day in total. The pattern the researchers found was a steady decline with age, not a problem to be corrected.
The bigger picture: it's exploration, and ripping is often just the same impulse with hands instead of a mouth
Mouthing at this age is generally understood as part of how toddlers explore texture, shape and how an object responds — does it bend, does it make a sound, does it come apart. A page that rips satisfyingly is answering the same kind of question a chewed corner is. It isn't usually anger at the book, and it isn't usually a sign your child dislikes reading. It's frequently the opposite: enough interest to want to handle the thing thoroughly, not just look at it.
Where it's genuinely uncertain
Most of the research on object mouthing, including the Juberg study, was designed around exposure to chemicals in plastics and toys, not books specifically — so there isn't a dedicated body of research on book-ripping as its own behavior. We're extending a well-established finding about general object exploration to books, which is a reasonable inference but not a direct one. It's also true that a small number of toddlers mouth and chew well past the typical age range, which can be worth mentioning to your pediatrician if it's intense or doesn't taper off, just as you would with any other sensory habit.
What this means this week
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Hand over board books and cloth books for solo exploration tonight, and save paper picture books for read-aloud time when you're holding the book together.
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Don't make a big production out of a torn page. A calm "let's be gentle with books" lands better than a reaction that makes the book feel like a source of trouble.
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Keep a couple of sturdy favorites in reach at all times, so the books available for independent play are ones that can take some handling.
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Notice if the chewing seems to ease off as your toddler nears two — for most children, it naturally does, right on the Juberg study's timeline.
Sources
Juberg, D. R., Alfano, K., Coughlin, R. J., & Thompson, K. M. (2001). An Observational Study of Object Mouthing Behavior by Young Children. Pediatrics, 107(1), 135–142.
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