A child’s normal breathing rate depends heavily on age, dropping steeply through infancy and continuing to slow all the way into adolescence. A newborn typically breathes around 40 to 60 times per minute, while a teenager breathes closer to 12 to 20 times per minute. The decline is steepest in the first two years of life, and a large systematic review found the median falls from about 44 breaths per minute at birth to roughly 26 at age two. Beyond those headline numbers, though, factors like sleep state, fever, and even altitude can shift a child’s rate enough to mimic illness or mask it.
Normal Breathing Rates by Age Group
Clinicians and pediatric guidelines generally divide childhood into several age bands, each with its own expected range. The numbers below reflect widely used clinical reference values alongside evidence from a major systematic review of observational studies covering birth through age 18:
- Newborn (0–1 month): 30 to 60 breaths per minute. Most healthy newborns sit near the middle of this range when calm and awake.
- Infant (1–12 months): 25 to 50 breaths per minute. The rate gradually drops through the first year as the lungs mature and the chest wall stiffens.
- Toddler (1–3 years): 20 to 40 breaths per minute. By the second birthday, the median approaches around 26 breaths per minute.
- Preschooler (4–5 years): 20 to 34 breaths per minute.
- School-age child (6–12 years): 18 to 30 breaths per minute.
- Adolescent (13–18 years): 12 to 20 breaths per minute, essentially matching the adult range.
These ranges are broad on purpose. A perfectly healthy 3-month-old might breathe 30 times per minute one moment and 50 the next, depending on whether they just woke up or are mid-feed. The systematic review that produced modern centile charts confirmed this steep early decline, showing the most dramatic drop happens before age two, with a much gentler decrease after that through adolescence.1PubMed Central. Normal ranges of heart rate and respiratory rate in children from birth to 18 years of age: a systematic review of observational studies
Why the Rate Falls So Steeply in Infancy
Newborns breathe fast because their lungs are small and their chest walls are soft and compliant. Each breath draws in a relatively small volume of air, so the body compensates by taking more breaths. As a child grows, lung tissue multiplies and the ribcage becomes more rigid, allowing each breath to move more air. By the time a child reaches school age, each breath is many times more efficient than a newborn’s, and the rate settles accordingly. This is not a sign of anything going wrong in the early months; it is the expected trajectory of lung development.
Sleep, Crying, and Wakefulness
The number you get when counting a child’s breaths depends a lot on what the child is doing at the time. In babies under six months, one study found that sleeping infants averaged about 42 breaths per minute, while awake and content babies averaged around 61, and crying babies fell in between at roughly 51.2PubMed Central. Respiratory rate and severity of illness in babies under 6 months old That is a gap of nearly 20 breaths per minute between asleep and awake in the same healthy baby.
This matters because if you count your child’s breathing rate when they are fussing or recently upset, you could easily get a number that looks alarming when nothing is actually wrong. For the most reliable reading at home, count while your child is calm and ideally while they are sleeping or resting quietly. Watch the rise and fall of the chest or belly for a full 60 seconds, or for 30 seconds and multiply by two. Shorter counts introduce rounding errors that get magnified.
How Fever Changes the Count
Fever is one of the biggest confounders when you’re trying to figure out whether a child’s breathing rate is normal. When body temperature rises, breathing speeds up to help the body shed heat. A study of children with acute respiratory infections found that for every 1°C rise in temperature, respiratory rate increased by about 6 to 7 breaths per minute, regardless of the child’s age or sex.3PubMed Central. The role of body temperature on respiratory rate in children with acute respiratory infections
In younger babies, the effect can be even larger. A randomized study using acetaminophen to isolate fever’s contribution estimated a correction factor of 5 to 7 extra breaths per minute per degree Celsius in children overall, and 7 to 11 extra breaths per minute per degree in infants under 12 months.4Journal of Clinical Epidemiology. Correcting respiratory rate for the presence of fever In practical terms, a 9-month-old running a fever of 39.5°C (about 103°F) could be breathing 10 to 15 breaths per minute faster than their usual baseline, purely from the fever itself. That is enough to push a normal rate well above the standard upper limit and make it look like something more serious is going on.
This does not mean you should ignore fast breathing in a feverish child. It does mean that treating the fever first and rechecking the rate 30 to 45 minutes later can give you a much clearer picture of whether the lungs themselves are in trouble.
Periodic Breathing in Newborns
If you’ve watched a sleeping newborn breathe, you may have noticed something that looks alarming: the baby breathes rhythmically for a stretch, then stops for a few seconds, then starts again. This pattern is called periodic breathing, and it is normal. It reflects the immature state of breathing control centers in a young infant’s brain.5Breathe. Sleep disordered breathing at the extremes of age: infancy
Research on healthy full-term infants found that brief pauses of 10 to 12 seconds occur occasionally, and that until about six months of age, most babies show at least a small amount of periodic breathing during sleep at home.6PubMed. Apnea and periodic breathing in normal full-term infants during the first twelve months The amount is typically less than 1% of total sleep time, so it tends to be something you catch by chance rather than something you’d notice consistently. It generally fades as the brain’s respiratory centers mature over the first several months.
The distinction worth knowing is between periodic breathing and true apnea. Periodic breathing involves short pauses (usually under 20 seconds) sandwiched between normal breathing cycles, and the baby’s color and tone stay normal. True apnea involves a longer pause, often with changes in skin color, limpness, or a drop in heart rate. If a pause lasts longer than 20 seconds, or if the baby turns blue or pale, that warrants immediate medical attention.
Living at High Altitude
Altitude is an overlooked factor that substantially affects children’s breathing rates. In a cross-sectional study across four countries, researchers measured respiratory rates in healthy infants and children under age two at various elevations. In low-altitude India (below about 920 meters), the average rate was around 32 breaths per minute. In Guatemala (roughly 1,000 to 2,100 meters), it climbed to about 42. In Rwanda (around 1,450 to 1,650 meters), it was 44. And in Peru, at 3,800 to 4,350 meters above sea level, the average hit 48 breaths per minute, about 16 breaths per minute higher than the low-altitude group.7PubMed Central. Effects of high altitude on respiratory rate and oxygen saturation reference values in healthy infants and children younger than 2 years in four countries: a cross-sectional study
A difference of 16 breaths per minute is enormous in clinical terms. At sea level, a rate of 48 in a toddler would almost certainly be flagged as fast breathing. At high altitude, it is the expected baseline. This is one of the reasons the World Health Organization and others have called for altitude-adjusted reference values, particularly for communities living above 2,500 meters. If you live in a high-altitude area and your young child seems to breathe faster than the standard ranges suggest, the elevation alone may explain it.
When Fast Breathing Signals a Problem
Fast breathing, or tachypnea, is one of the key indicators clinicians use to screen for lower respiratory infections in children. The World Health Organization has long recommended it as a frontline proxy for pneumonia in settings where chest X-rays aren’t readily available.8PubMed. Lack of predictive value of tachypnea in the diagnosis of pneumonia in children The WHO thresholds define fast breathing as more than 60 breaths per minute for babies under two months, more than 50 for children aged two to twelve months, and more than 40 for children one to five years old.
Those thresholds are useful as screening tools, but they are not perfect. The same study that highlighted the WHO recommendation also noted that tachypnea alone has limited predictive value for pneumonia. Other conditions, including metabolic acidosis from dehydration and diarrhea, can also drive the breathing rate up without any lung infection being present.9PubMed Central. Age specific fast breathing in under-five diarrheal children in an urban hospital: Acidosis or pneumonia? This is why respiratory rate is best interpreted alongside other signs rather than in isolation.
In newborns specifically, respiratory distress can look somewhat different. Alongside fast breathing, watch for chest retractions (the skin pulling inward between the ribs or below the ribcage with each breath), nasal flaring, grunting sounds on exhale, or bluish discoloration of the lips or fingertips. A study of 640 neonates found that roughly one in five developed some form of respiratory distress, with the majority of cases being mild.10Karnataka Paediatric Journal. A clinical study on respiratory distress in newborns and its outcome The most common cause was transient tachypnea of the newborn, a self-limited condition caused by delayed clearing of lung fluid after birth, followed by respiratory distress syndrome and infections.
Why Many Published Reference Ranges Are Inaccurate
If you look up “normal respiratory rate for children” in different textbooks, hospital protocols, or online reference guides, you’ll find ranges that disagree with each other, sometimes dramatically. This is not just harmless variation. When the systematic review behind the modern centile charts compared its evidence-based ranges to existing published reference values, the researchers found striking disagreement: many commonly cited upper and lower limits fell outside even the 99th and 1st centiles derived from actual observational data, or they crossed the median entirely.1PubMed Central. Normal ranges of heart rate and respiratory rate in children from birth to 18 years of age: a systematic review of observational studies
In plainer terms, some of the “normal” limits printed in widely used clinical references were so far off that they would classify most healthy children as abnormal, or fail to flag children who actually were breathing unusually fast. The problem arose because many older reference ranges were based on expert opinion, small samples, or a single hospital’s data rather than a large body of pooled evidence. The 2011 systematic review that produced age-specific centile charts was a direct response to this problem, and it remains one of the best evidence-based resources for pediatric vital sign ranges. If you encounter a reference range that looks starkly different from the numbers listed in this article, the older source may simply predate the better evidence.
Counting at Home and the Limits of Technology
The simplest and most reliable way to count your child’s breathing rate at home is also the lowest-tech: watch the chest or belly rise and fall, count each cycle for a full minute using a clock or phone timer, and do it while the child is resting quietly. If you’re checking because you’re concerned about illness, try to count before or after a feeding and when the child is not crying. Remember that sleep rates run lower than awake rates by a significant margin.
Automated devices are increasingly common in clinical settings, but they have real limitations in children. One study in a hospital in the Democratic Republic of Congo tested an automated pulse oximeter that also counted respiratory rate against a trained nurse counting manually. The device frequently underestimated the rate, particularly when breathing was fast. It missed fast breathing, as defined by WHO criteria, in about one in four children who actually had it.11PubMed Central. Performance of Automated Point-of-Care Respiratory Rate Counting versus Manual Counting in Children under Five Admitted with Severe Febrile Illness to Kisantu Hospital, DR Congo That is a clinically meaningful miss rate, especially in settings where respiratory rate is the primary screening tool for pneumonia.
On the more experimental end, researchers have been developing contact-free monitoring systems that use depth cameras to track chest wall movement in real time. One system designed for pediatric intensive care units uses a depth-sensing camera to estimate tidal volume, respiratory rate, and other ventilatory parameters without touching the child at all.12PubMed Central. Real-Time Current Volume Estimation System from an Azure Kinect Camera in Pediatric Intensive Care: Technical Development These systems are still in early development and not available for home use, but they reflect a growing recognition that traditional monitoring methods are either intrusive or unreliable in young children. For now, your own eyes and a timer remain the gold standard for a quick check at home.
Practical Guidance for Parents
Knowing the ranges is useful, but knowing what to do with them is more useful. Here are some practical takeaways if you’re a parent watching a child breathe:
- Establish a baseline: Count your child’s resting breathing rate a few times when they are well, so you have a personal reference point. Normal varies from child to child within the expected range.
- Account for context: A recently crying, just-fed, or feverish child will breathe faster. If the rate seems high, address the fever or let the child settle and recount in 30 minutes.
- Watch patterns, not just numbers: A single elevated count is less concerning than a persistently elevated rate across multiple checks, especially with other symptoms like retractions, color changes, or lethargy.
- Altitude awareness: If you live above 1,500 meters or so, expect your young child’s resting rate to run higher than sea-level charts predict. Mention your elevation when speaking to a healthcare provider who may be unfamiliar with your area.
- Newborn pauses are usually normal: Brief breathing pauses during sleep in the first few months do not require action if the baby’s color and muscle tone stay normal and the pauses stay under 20 seconds.
The respiratory rate is one of the most informative vital signs in pediatrics precisely because it changes reliably in response to so many things: growth, fever, infection, anxiety, altitude, and sleep. That sensitivity makes it powerful but also easy to misread without context. A number by itself tells you less than a number paired with what the child was doing, how they looked, and whether the pattern repeated over time.
When Breathing Rate and Respiratory Effort Do Not Match
One scenario that trips up parents and sometimes clinicians: a child whose breathing rate is technically within the normal range but who is clearly working hard to breathe. Respiratory effort matters as much as speed. A child breathing 35 times per minute with visible rib retractions, a tugging movement at the notch above the breastbone, or audible grunting is in more trouble than a child breathing 50 times per minute after running around the yard. The fast rate after exercise is demand-driven and will come down on its own within a few minutes. Labored breathing at a “normal” rate may mean the child’s body is struggling to compensate and is reaching its limits.
Conversely, in very sick children, the breathing rate can sometimes slow to deceptively “normal” levels because the child is exhausted and losing the ability to maintain the rapid rate their body needs. A dropping respiratory rate in a child who was previously breathing fast and still looks unwell is not reassuring; it can actually be a warning sign of respiratory failure. If you see this pattern, especially combined with drowsiness or a limp posture, seek emergency care.