My Baby Sleeps with Mouth Open
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, AAP, CDC guidelines
Last reviewed:
Sleep concerns affect nearly every family at some point. When it comes to sleeps with mouth open, here is what the guidelines recommend.
The short answer
Occasional mouth breathing during sleep is common in babies, especially when congested from a cold or teething. However, habitual mouth breathing can indicate nasal obstruction or enlarged tonsils/adenoids and may affect sleep quality and development. If your baby consistently sleeps with their mouth open, mention it to your pediatrician.
Key takeaways
- Occasional mouth breathing during sleep is common in babies, especially when congested from a cold or teething. However, habitual mouth breathing can indicate nasal obstruction or enlarged tonsils/adenoids and may affect sleep quality and development. If your baby consistently sleeps with their mouth open, mention it to your pediatrician.
- Usually normal when: Your baby occasionally breathes through their mouth when congested from a cold or teething
- Call your doctor if: Your baby has significant difficulty breathing, is gasping, or has retractions (pulling in of the chest)
- Varies by age — see the age-by-age breakdown below
“To reduce the risk of sleep-related infant deaths, the AAP recommends that infants sleep on their backs, on a firm, flat surface, without any soft bedding.”
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What Parents Should Know
According to AAP, CDC guidelines, occasional mouth breathing during sleep is common in babies, especially when congested from a cold or teething. However, habitual mouth breathing can indicate nasal obstruction or enlarged tonsils/adenoids and may affect sleep quality and development. If your baby consistently sleeps with their mouth open, mention it to your pediatrician. At 0-3 months, newborns are typically obligate nose breathers, meaning they strongly prefer breathing through their nose. If your young baby is breathing through their mouth, it often indicates nasal congestion. Common causes include residual amniotic fluid, dry air, or normal newborn congestion. Using a cool-mist humidifier and saline drops can help. Persistent mouth breathing in a newborn should be evaluated to rule out structural issues. It is generally considered normal when your baby occasionally breathes through their mouth when congested from a cold or teething. However, you should contact your pediatrician promptly if your baby has significant difficulty breathing, is gasping, or has retractions (pulling in of the chest).
Normal vs. Concerning
By Age
What to expect by age
0-3 months
Newborns are typically obligate nose breathers, meaning they strongly prefer breathing through their nose. If your young baby is breathing through their mouth, it often indicates nasal congestion. Common causes include residual amniotic fluid, dry air, or normal newborn congestion. Using a cool-mist humidifier and saline drops can help. Persistent mouth breathing in a newborn should be evaluated to rule out structural issues.
3-6 months
Babies this age may mouth breathe when congested from a cold or during teething. Brief periods of mouth breathing during illness are normal. However, if your baby consistently breathes through their mouth even when well, or if you notice snoring, noisy breathing, or pauses, it could indicate enlarged adenoids or other obstruction. Your baby should be able to nurse or bottle-feed without excessive gasping or struggling.
6-12 months
Habitual mouth breathing at this age can interfere with feeding, sleep quality, and even facial development over time. Babies who mouth breathe may be more prone to ear infections, have difficulty gaining weight, or seem excessively tired. Common causes include allergies, chronic congestion, enlarged tonsils/adenoids, or structural issues like a deviated septum. If your baby is a persistent mouth breather, an evaluation by your pediatrician is warranted.
12-24 months
Toddlers who habitually sleep with their mouth open may snore, have restless sleep, or show signs of sleep-disordered breathing. They might wake frequently, sweat excessively, or sleep in unusual positions (hyperextended neck to keep airway open). Chronic mouth breathing can lead to dental issues, facial changes, and developmental concerns. Your pediatrician may refer you to an ENT specialist for evaluation of tonsils, adenoids, or structural issues.
What to Tell Your Pediatrician
- Describe when you first noticed sleeps with mouth open and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby consistently sleeps with their mouth open, even when not visibly congested.
- Mention if you notice snoring, noisy breathing, or pauses in breathing during sleep.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Your baby occasionally breathes through their mouth when congested from a cold or teething
- Mouth breathing is temporary and resolves when the congestion clears
- Your baby can easily breathe through their nose when awake and calm
- Your baby feeds well, sleeps soundly, and is growing appropriately
- There is no snoring, gasping, or pauses in breathing
- Your baby consistently sleeps with their mouth open, even when not visibly congested
- You notice snoring, noisy breathing, or pauses in breathing during sleep
- Your baby seems excessively tired during the day, is irritable, or has difficulty feeding
- Your baby has frequent ear infections, chronic congestion, or allergies
- You're concerned about your baby's breathing pattern or sleep quality
- Your baby has significant difficulty breathing, is gasping, or has retractions (pulling in of the chest)
- Your baby's lips or skin have a blue or grey tinge
- Your baby stops breathing during sleep for more than 10-20 seconds
- Your baby is unresponsive, extremely lethargic, or very difficult to wake
What You Can Do at Home
- Keep track of when you notice sleeps with mouth open — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that your baby occasionally breathes through their mouth when congested from a cold or teething — this is generally within the range of normal.
- At 0-3 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Maintain a consistent bedtime routine. Keep the sleep environment cool, dark, and quiet.
- While monitoring at home, seek immediate care if your baby has significant difficulty breathing, is gasping, or has retractions (pulling in of the chest).
Related Resources
Milestone Checklists by Age
Track your baby's developmental milestones from birth to 5 years with age-specific checklists.
Breathing Difficulty Triage
Assess breathing concerns and know when to seek emergency care.
Baby Sleep Guide
Age-by-age sleep needs, schedules, and evidence-based sleep strategies.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is sleeps with mouth open normal?
When should I call the doctor about sleeps with mouth open?
When is sleeps with mouth open normal?
What causes sleeps with mouth open?
What should I mention to my pediatrician about sleeps with mouth open?
Is sleeps with mouth open normal at 0-3 months?
Is sleeps with mouth open normal at 3-6 months?
Should I go to the ER for sleeps with mouth open?
Does sleeps with mouth open go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss My Baby Sleeps with Mouth Open.
Things to mention
- Describe when you first noticed sleeps with mouth open and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby consistently sleeps with their mouth open, even when not visibly congested.
- Mention if you notice snoring, noisy breathing, or pauses in breathing during sleep.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Your baby consistently sleeps with their mouth open, even when not visibly congested
- You notice snoring, noisy breathing, or pauses in breathing during sleep
- Your baby seems excessively tired during the day, is irritable, or has difficulty feeding
Urgent signs to report immediately
- Your baby has significant difficulty breathing, is gasping, or has retractions (pulling in of the chest)
- Your baby's lips or skin have a blue or grey tinge
- Your baby stops breathing during sleep for more than 10-20 seconds
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of sleeps with mouth open are normal. Talk to your pediatrician if your baby has significant difficulty breathing, is gasping, or has retractions (pulling in of the chest).
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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