Baby Sleeping With Mouth Open, Is It Normal?
It is not normal for a child to sleep with their mouth open!
When a baby consistently sleeps with their mouth open, it can indicate an underlying concern such as nasal congestion, airway obstruction, deviated septum or even sleep apnea. Though it’s not uncommon for babies to breathe through their mouths when they have a cold, healthy babies predominately breathe through their noses [1]. If your baby regularly sleeps with their mouth open, especially over an extended period, it’s a good idea to consult with a pediatrician.


Written & Reviewed by Dr. Ngo, Pediatric Dentist and Resident with Tufts University School of Dental Medicine for Pediatric Sleep Medicine
What causes a newborn baby to sleep with their mouth open?
Here are some of the possile reasons for mouth breathing in newborn babies:
- Nasal Congestion: A stuffy nose due to mucus buildup or a cold can make nasal breathing difficult, causing babies to rely on mouth breathing.
- Blocked Airway: Enlarged tonsils, adenoids, or other physical obstructions can limit airflow, leading to persistent mouth breathing.
- Sleep Apnea: In some cases, mouth breathing is linked to sleep apnea, a condition where airflow is repeatedly blocked during sleep.
- Habit Formation: Even after recovering from a cold or congestion, some babies may continue mouth breathing out of habit.
- Deviated Septum: A structural issue in the nasal passage, such as a deviated septum, can make nasal breathing more challenging.
Click Here to read from another source:
The article below goes into detail on the developmental and behavior issues that come with mouth breathing.
Read here below on the causes and symptoms of mouth breathing from a dental perspective.
- International Journal of Pediatrics. (2012). It Takes a Mouth to Eat and a Nose to Breathe: Abnormal Oral Respiration Affects Neonates’ Oral Competence and Systemic Adaptation, 2012. https://pmc.ncbi.nlm.nih.gov/articles/PMC3397177/
Trustindex verifies that the original source of the review is Google. Highly recommend! We've been going here for years now & I never have a complaint! Haley2025-07-31Trustindex verifies that the original source of the review is Google. If you’re looking for a place that works well with kids I definitely recommend them, the staff is very welcoming and know how to make the visit fun and non scary for the kiddos! My kid leaves this place wanting to go back everytime Jas Carrillo2025-07-23Trustindex verifies that the original source of the review is Google. Dr Ngo and team are absolutely great with kids. They go beyond the usual cleaning and talk about jaw, bite, speech and oral health overall. We are grateful to have them local and our kids love going in! Brian Robertson2025-07-10Trustindex verifies that the original source of the review is Google. Me encanta como tratan amos niños Guadalupe Gonzalez2025-06-26Trustindex verifies that the original source of the review is Google. Great! took care and kept my daughter calm fast and detailed. Paul Carter2025-06-25Trustindex verifies that the original source of the review is Google. My son, had a great experience. They were great with my son who is four years old and he felt very comfortable. Great place to take your kids! Danieal Longanetti2025-06-21Trustindex verifies that the original source of the review is Google. We have been coming to Kid Focus for years and absolutely love it!!! Stephanie Rodriguez2025-06-16