Mouth breathing in toddlers: early signs that matter
14 August 2026 · 5 min read
Open-mouth breathing at rest reshapes the face and the bite. Spotting it early is one of the most important things a parent can do.
What normal looks like
From around 18 months, a child at rest should breathe through the nose with the lips gently together and the tongue resting on the palate. This supports facial growth, keeps the airway warm and filtered, and holds the upper jaw in a wide shape.
Signs to take seriously
A child who sleeps with the mouth open, snores, is restless at night, always has the lips apart when relaxed, drools more than peers, or has a long, narrow face is worth assessing. Mouth breathing over months narrows the upper jaw, lowers the tongue, and changes facial growth.
What we do about it
We look at the airway, tonsils and adenoids, tongue posture, and jaw shape, and work with ENT or paediatric colleagues when needed. Often the cause is enlarged adenoids or allergies, and early treatment — together with tongue and breathing exercises — protects the developing face.
Questions about your child's smile or breathing?
Book an online consultation or visit one of our clinics for a full orthodontic and airway assessment.
Choose your regionMore articles
- When should I start cleaning my baby's mouth?Oral care starts on day one — before the first tooth even appears. Early habits set the stage for healthy teeth and easier brushing later.
- Baby teething: what to expect and how to helpTeething is a normal, staged process from around 6 months to age 3. Here is what the timeline looks like and what actually soothes a teething baby.
- Your child's first dental visit: why by age oneThe first dental check should happen by the first birthday or when the first tooth appears. Here's what happens and how to make it easy.