Toddlers put everything in their mouths because it’s one of the most effective ways their developing brains can gather information about the world. A young child’s mouth is packed with sensory nerve endings that provide detailed feedback about an object’s texture, shape, temperature, and size. Before their fine motor skills fully develop, mouthing is often more informative than touching.
The Mouth as a Sensory Tool
Adults explore new objects by turning them over in their hands, feeling the surface, testing the weight. Toddlers do the same thing with their mouths. The lips, tongue, and inner cheeks contain a dense concentration of sensory receptors that relay rich information to the brain. For a child whose fingers are still developing the precision needed for detailed tactile exploration, the mouth offers a shortcut to understanding what something is.
This behavior starts in infancy and typically peaks between about 12 and 24 months. During this window, children are rapidly building mental categories for the objects around them. Is this hard or soft? Smooth or rough? Does it bend? Mouthing helps answer those questions faster than clumsy toddler hands can. As fine motor control improves and language develops, giving children other ways to categorize their environment, the mouthing gradually decreases. Most children significantly reduce the behavior by age 3.
Teething Adds Another Layer
Not all mouthing is pure exploration. For toddlers who are still cutting teeth, chewing on objects provides genuine pain relief. Pressure against swollen gums counteracts the discomfort of a tooth pushing through. This is the same principle behind rubbing a baby’s gums with a clean finger or wet gauze for a couple of minutes, a technique the Mayo Clinic recommends for soothing sore gums. Chilled teething rings work through the same mechanism, combining pressure with a mild numbing effect from the cold.
Teething can continue well past the first birthday. Most children don’t get their full set of primary teeth until around age 2.5 to 3, which means teething-related mouthing overlaps significantly with the exploratory phase. If your toddler seems to chew more aggressively on hard objects, drools heavily, or is fussier than usual, teething is likely part of the equation.
When Mouthing Becomes a Concern
Normal mouthing is developmental and fades on its own. But if a child older than 2 consistently eats non-food substances like dirt, paint chips, or paper, it may meet the criteria for pica. The DSM-5 defines pica as eating non-nutritive, non-food substances for at least one month, in a way that isn’t appropriate for the child’s developmental stage. The key detail: a child must be at least 2 years old for this diagnosis. Before that age, eating non-food items is considered developmentally normal, even if it’s alarming to watch.
Pica can be linked to nutritional deficiencies (particularly iron or zinc), developmental conditions, or sensory processing differences. If your child is past their second birthday and still regularly eating things that aren’t food, it’s worth raising with their pediatrician.
The Real Choking Risk
The most immediate danger of mouthing is choking. CDC data shows that roughly 17,500 children under 14 were treated in emergency departments for choking-related episodes in a single year. About 31% of those cases involved non-food objects. Coins were the single most common non-food culprit, responsible for over 1,650 choking episodes among children ages 1 to 4 alone.
The Consumer Product Safety Commission defines a choking hazard as any object that fits entirely inside a test cylinder measuring 1.25 inches wide and 2.25 inches long, roughly the size of a young child’s fully expanded throat. A practical shortcut: if something can fit through a toilet paper roll, it’s too small for a toddler’s environment. Batteries (especially button batteries), marbles, pen caps, small magnets, and deflated balloons are among the most dangerous items that commonly end up in toddlers’ mouths.
Lead and Chemical Exposure
Choking isn’t the only hazard. Children’s frequent hand-to-mouth and object-to-mouth behavior significantly increases their exposure to environmental toxins, particularly lead. Young children absorb 4 to 5 times as much lead as adults from an ingested dose, according to the World Health Organization. Lead-contaminated dust, soil, and deteriorating paint in older homes are common sources, and a toddler who mouths a windowsill, picks up soil, or chews on an old painted toy can ingest meaningful amounts.
Household plants are another overlooked risk. Several common varieties can cause harm if a toddler chews on leaves or stems. Philodendron, elephant’s ear, and snake plant cause painful mouth irritation on contact. Others, including azalea, foxglove, and hydrangea, are genuinely poisonous if swallowed. If you have houseplants, it’s worth verifying each one is non-toxic and keeping any questionable plants completely out of reach.
Keeping Mouthed Toys Clean
Since you can’t stop a toddler from mouthing, keeping their most-chewed items clean matters. The American Academy of Pediatrics recommends cleaning and disinfecting toys after each use, at minimum once daily, and immediately whenever a toy is visibly soiled with dirt or saliva. For hard plastic and rubber toys, a simple wash with soap and water followed by a diluted bleach rinse (then air drying) is effective. Stuffed animals and fabric toys that get mouthed can go through the washing machine on a hot cycle.
Rotating toys helps too. Having a set of “mouthing toys” that you cycle through the cleaning process means your toddler always has something safe and clean to explore while yesterday’s batch gets washed.
How to Work With the Behavior
Trying to stop mouthing entirely is fighting a child’s neurobiology. A more effective approach is redirecting it toward safe options. Keep a supply of age-appropriate teething toys, textured silicone chews, and washable soft toys accessible. When your toddler grabs something unsafe, swap it without fanfare. A calm “that’s not for mouths, here’s one that is” teaches the boundary without turning the object into a fascination.
Floor checks become a daily habit during the mouthing phase. Getting down to your toddler’s eye level and scanning for small objects, dropped coins, stray pieces of older siblings’ toys, or anything else that could end up in a mouth takes 30 seconds per room and catches the most common hazards. Keeping purses, backpacks, and visitors’ bags off the floor eliminates another frequent source of coins, medication, and small items that toddlers find irresistible.
The mouthing phase feels relentless while you’re in it, but it serves a genuine developmental purpose. Your toddler is building a sensory map of the world, one taste and texture at a time. The goal isn’t to stop the behavior but to make sure the objects they explore are safe, clean, and appropriately sized.