A 2-month-old is sleeping quietly. A parent counts the breaths for one minute and gets 48. The baby looks comfortable, with no visible chest pulling or color changes.
How would you describe this breathing rate?
Baby & Child Vital Signs
Vital signs tell a story about how a baby's heart, lungs, and body are working. This hub explains what normal looks like at every age — and what changes are worth describing to your child's doctor.
Explore by vital sign
Breathing Rate
How fast a baby breathes — and what is normal by age
Heart Rate
Normal pulse ranges from newborn through childhood
Blood Oxygen
What a pulse oximeter reads and what the numbers mean
Body Temperature
Normal temperature, fever threshold, and how to measure accurately
Blood Pressure
Age-based normal ranges and when blood pressure is checked
What are vital signs and why do they matter in babies and young children?
- Vital signs are basic body measurements that show how the heart, lungs, and temperature control systems are working
- The main vital signs in babies and young children are heart rate, breathing rate, body temperature, blood oxygen level, and blood pressure
- Babies and young children have different normal ranges than older children and adults — what looks fast for an adult may be completely normal for a newborn
- Vital signs change naturally throughout the day — they rise with crying, feeding, activity, and fever, and fall during calm states and sleep
- Pediatricians use vital signs as one part of a bigger picture that also includes how a child looks, feeds, and behaves
- A single reading is rarely the full story — patterns and trends over time are often more meaningful than one number
- Understanding what is normal for each age helps parents recognize and describe changes to their child's doctor
What are normal vital sign ranges for babies and young children?
- Heart rate and breathing rate are both highest at birth and gradually decrease as children grow
- A newborn's heart rate typically ranges from 110 to 160 beats per minute — by school age this settles closer to 60 to 100 beats per minute
- A newborn's breathing rate is typically 30 to 60 breaths per minute — by age 6 this falls to around 20 to 25 breaths per minute
- These ranges are wide — healthy babies of the same age can have noticeably different resting rates
- Normal body temperature is generally below 100.4°F (38°C) — a reading at or above this threshold is considered a fever at any age
- Blood oxygen level (SpO₂) measured by a pulse oximeter should generally read 95% or above in babies and young children
- During sleep, both heart rate and breathing rate tend to run lower than during waking hours — this is expected
What causes vital sign changes in babies and young children?
- Fever is one of the most common reasons vital signs change — when body temperature rises, heart rate and breathing rate typically increase as well
- Viral respiratory illnesses such as bronchiolitis, croup, and the common cold can raise breathing rate and increase the visible effort of breathing
- Dehydration from vomiting, diarrhea, or poor fluid intake can raise heart rate as the body works to maintain circulation
- Pain, discomfort, and distress — including ear infections and gas — can temporarily elevate heart rate
- Activity, excitement, and crying are normal everyday causes of faster heart rate and breathing rate
- Sleep naturally lowers both heart rate and breathing rate, and some variation during sleep is expected
- In most cases, vital sign changes caused by everyday activity or mild illness return to normal once the cause resolves
When should parents pay closer attention to vital sign changes?
- A breathing rate that stays fast even when a baby is calm and at rest — not just during crying or feeding — is worth describing to a doctor
- Breathing that looks effortful, with visible chest pulling, nostril widening, or grunting sounds alongside a fast rate, is more significant than a fast rate alone
- A heart rate that remains unusually fast or slow at rest — especially if a baby also looks pale, sweaty, or limp — warrants a closer look
- Fever in a baby younger than 3 months (100.4°F / 38°C or higher) is generally a reason to seek prompt medical evaluation regardless of how the baby appears
- Blue or gray color around the lips, tongue, or gums — especially at rest — combined with any vital sign change is a reason to seek immediate medical attention
- A single mildly elevated reading during crying or activity is usually less concerning than a pattern of persistently abnormal numbers at rest
- A child who is difficult to wake, refuses to feed, or shows a significant change in behavior alongside abnormal vital signs may need prompt evaluation
How do pediatricians evaluate vital signs in babies and young children?
- Pediatricians measure vital signs at every well-child visit and sick visit — this builds a personal baseline for each child over time
- Heart rate is measured by listening with a stethoscope or using a pulse oximeter placed on a finger or toe
- Breathing rate is counted by watching chest or belly movements for a full minute, ideally when the child is calm or sleeping
- Temperature is measured using age-appropriate methods — rectal thermometers are generally recommended for accuracy in babies under 6 months
- Blood oxygen level is measured with a small painless sensor (pulse oximeter) — normal readings are generally 95% or above
- Capillary refill time — pressing briefly on a fingertip and watching how quickly the pink color returns — gives information about circulation; normal refill is about 2 seconds
- Vital signs are always interpreted alongside a child's overall appearance, feeding, hydration, and behavior — no single number is evaluated in isolation
