What is a normal breathing pattern for a child?

Normal Breathing Pattern in Children

Children should breathe through their nose with a stable, regular pattern that varies by age, with respiratory rates declining from approximately 44 breaths per minute at birth to 26 breaths per minute by age 2 years, and heart rates peaking at 145 beats per minute around 1 month before declining to 113 beats per minute by age 2 years. 1

Age-Specific Normal Respiratory Rates

The respiratory rate shows a steep decline during the first two years of life, then continues to decrease more gradually through adolescence 1:

• Newborns (birth): Median 44 breaths/min 1
• Infants (2 years): Median 26 breaths/min 1
• Early adolescence: Continues declining to adult rates 1

The steepest fall in respiratory rate occurs in infants under 2 years of age, making this period critical for understanding normal developmental changes 1.

Normal Breathing Pattern Characteristics

Route of Breathing

• Nasal breathing is the normal pattern during quiet, stable breathing 2
• The child should maintain a sitting position when possible for optimal respiratory mechanics 2

Pattern Stability

• Slow and regular breathing is the expected pattern during quiet wakefulness 2
• The respiratory pattern should be stable and natural before being considered normal 2
• At least 10 consecutive stable breaths should be observable to confirm pattern regularity 2

Thoracoabdominal Coordination

• In-phase thoracoabdominal respiration (chest and abdomen moving together) is the most frequent normal pattern during quiet sleep 3
• Out-of-phase breathing can occur normally during active sleep but should not be the predominant pattern during quiet wakefulness 3
• Nasal airflow always occurs in phase with abdominal movements 3

Normal Variations and Acceptable Pauses

Apneic Pauses

Normal full-term infants may have brief respiratory pauses that should not cause concern 4, 5:

• Pauses of 10-12 seconds occur occasionally in normal infants 4
• No apnea ≥15 seconds should occur in healthy full-term infants during the first year 4
• At age 2 years, isolated pauses up to 15 seconds can occur rarely (8 pauses in 6 children studied) 5

Periodic Breathing

• Periodic breathing (sequences of 3+ apneic pauses separated by <20 breaths) is common and normal in young infants 4, 5
• 78% of infants at 0-2 weeks exhibit periodic breathing, decreasing to 29% by 39-52 weeks 4
• When present, periodic breathing typically occupies <1% of sleep time until 6 months of age 4
• The total duration remains stable (median 0.06 min/h at 6 weeks vs 0.05 min/h at 2 years) 5

Age-Specific Heart Rate Patterns

Heart rate follows a unique developmental trajectory 1:

• Birth: Median 127 beats/min 1
• 1 month: Peak at median 145 beats/min 1
• 2 years: Median 113 beats/min 1
• Continues declining through adolescence to adult rates 1

Clinical Pitfalls to Avoid

Common Assessment Errors

• Do not use adult breathing criteria for children, as modified age-appropriate standards are essential 2
• Position matters: The child's posture during examination affects breathing patterns and must be standardized (preferably sitting) 2, 6
• Sleep state affects pattern: Out-of-phase thoracoabdominal breathing during active sleep is normal and should not be misinterpreted as pathology 3

Misdiagnosis Risks

• Normal brief apneic pauses should not be confused with pathologic apnea requiring intervention 4, 5
• Periodic breathing in infants <6 months is typically benign when occupying <1% of sleep time 4
• Dysfunctional breathing presents with altered patterns at rest that amplify during exercise, often with normal spirometry—this differs from normal developmental variations 7

When to Suspect Abnormal Breathing

Red flags that deviate from normal patterns include 7:

• Persistent mouth breathing during quiet wakefulness (nasal breathing is normal) 2
• Shortness of breath or chest discomfort, particularly during exercise 7
• Apnea >15 seconds in infants or frequent prolonged pauses 4
• Stridor or audible breathing during rest 7
• Persistent out-of-phase thoracoabdominal breathing during quiet wakefulness 3