Assessing a child is not just a smaller version of assessing an adult. Children are still developing, so every finding has to be judged against what is expected for that child's age and developmental stage. A heart rate that would alarm you in a teenager can be perfectly normal in an infant — and the reverse is also true.
The assessment actually begins before the physical examination. The moment you walk in, you are gathering data: how the child behaves, how active they are, and how they interact with their caregiver. You also gather information from both the child and the caregiver — the caregiver knows the child's baseline, and the child (even a young one) is a real source of information too. Everything about your approach — communication, technique, interpretation — gets adapted to the child's developmental level.
The history starts with the chief complaint (the main reason for the visit, in the family's own words) and the history of present illness (the story of that problem: when it started, how it has changed, what helps or worsens it). But a pediatric history reaches much further back than an adult one, because a child's past literally built the child in front of you.
You also collect the prenatal, birth, and past health history (pregnancy events, delivery, and prior illnesses or injuries), medications, allergies, and immunizations, and a developmental history (when milestones were reached). Then the daily-life picture: nutrition, sleep, elimination, and activity, plus school, behavior, family, and home environment. Finally, the review of systems walks body system by body system to catch anything the family forgot to mention.
Your approach has to match the child's developmental stage, because each stage thinks — and fears — differently:
With adolescents, address the adolescent directly, provide privacy, and explain confidentiality — what you will keep private and what you cannot. Respect modesty and their developing independence. The physical exam is only half the job: you also explore emotional and social functioning and assess risk behaviors and safety.
Six principles run the whole exam. Observe general appearance before touching — you get honest baseline data before the child reacts to you. Use a flexible examination sequence: there is no sacred head-to-toe order in pediatrics, so adapt to the child. Begin with the least threatening procedures (watching, listening) and save uncomfortable procedures for last — ear and throat checks go at the end, because once a young child is crying and fighting, every later measurement is distorted. Throughout, maintain warmth, privacy, and caregiver support, and adapt everything to the child's developmental level and clinical condition.
Before hands-on, assess: alertness and responsiveness, activity and behavior, posture, movement, and gait (the child's walking pattern), respiratory effort (how hard the child is working to breathe), skin color and perfusion (perfusion means how well blood is reaching the tissues — pink and warm is good; pale, mottled, or blue is not), and interaction with the caregiver. The critical step: compare every observation with what is expected for the child's age. A toddler who won't leave a parent's lap is normal; a previously playful child who lies limp and uninterested is a warning sign at any age.
The single most testable fact in this chapter: normal heart rate and respiratory rate decrease with age. A newborn's heart beats fast because a small heart moves a small amount of blood per beat — rate makes up for size. As the child grows, both rates settle down.
Technique matters as much as the numbers. Fever, crying, activity, and anxiety all raise heart and respiratory rates, so assess when the child is calm whenever possible — or you will chart a crying spike as if it were the child's baseline. In young children, count heart rate and respirations for a full minute, because their rhythms are irregular enough that a 15-second sample can mislead. Use appropriately sized equipment, and always evaluate vital signs with the entire clinical picture, never as isolated numbers.
For temperature, choose the route based on age and cooperation and use the least invasive reliable method. Avoid inappropriate rectal measurement — rectal temperatures are invasive, distressing, and carry risk, so they are reserved for situations that truly require them. For pulse oximetry (measuring the oxygen level in the blood with a small sensor clipped or taped to a finger, toe, or foot), choose an appropriately sized sensor and verify the pulse signal and probe placement — the reading is only trustworthy if the sensor is actually picking up the pulse. Motion and poor perfusion affect accuracy, so a cold, wiggling child can produce a falsely low number.
Routine blood pressure screening generally begins at age 3. Pediatric BP is read against pediatric reference values (tables based on age, sex, and height) — never adult cutoffs. Technique: use an appropriately sized cuff, position the arm at heart level, and measure while the child is calm whenever possible, since a crying or struggling child reads falsely high.
Measure weight and length/height at every visit, plus head circumference in young children (it tracks brain growth). The body-proportion measure changes with age: weight-for-length is used for children younger than 2 years, and BMI-for-age (body mass index — a weight-for-height calculation — plotted against age-based charts) for children 2 years and older. Plot every measurement on the appropriate growth chart.
The interpretation rule: evaluate growth trends rather than single values. One measurement is a dot; the pattern of dots is the diagnosis. Generally reassuring: a consistent growth trajectory (the child follows their own curve), age-appropriate developmental progress, and proportionate growth.
For skin, assess color, temperature, moisture, and integrity (whether the skin is intact), always considering natural skin pigmentation — pallor and color changes look different across skin tones, so check mucous membranes and nail beds too. Identify rashes, lesions, bruising, and birthmarks, and assess hydration (the body's fluid level) and perfusion.
Four distinctions carry the exam weight here. Acrocyanosis (blueness of the hands and feet only) may be normal immediately after birth, while central cyanosis (blueness of the lips, tongue, and trunk from low blood oxygen) is always abnormal. Bruising must be consistent with developmental ability — a baby who cannot yet roll or cruise cannot collect the bruises of a toddler who falls daily, so bruising on a non-mobile infant is a red flag. And petechiae (tiny pinpoint red-purple spots from bleeding under the skin) and purpura (larger purple patches of the same process) require clinical evaluation — they are never "just a rash."
Hydration assessment is a cluster, not a single sign: mucous membrane moisture (dry mouth = dry child), tears when crying (absent tears signal significant fluid loss), urine output and wet diapers, fontanel appearance (the fontanel is the "soft spot" where an infant's skull bones have not yet fused; a sunken fontanel suggests dehydration), capillary refill (press the skin or nail bed and time how fast color returns — slow refill means poor perfusion), skin turgor (the skin's springiness; dehydrated skin stays tented when gently pinched), and heart rate and general appearance.
Assess the head's size, shape, and symmetry, observe head control and neck movement, and evaluate head circumference in young children. Assess the fontanels when age-appropriate — a bulging fontanel can signal raised pressure inside the skull, a sunken one dehydration. Inspect and palpate (feel with the fingers) the cervical lymph nodes (the chains of small immune glands in the neck), and flag any unexpected masses, tenderness, or limited movement.
Eye findings are a study in "normal for a newborn, abnormal later." Brief, intermittent eye misalignment in early infancy may be normal — a newborn's eye muscles are still learning to work together. But persistent strabismus (eyes that do not line up and look in the same direction) beyond early infancy requires evaluation, because the brain may start ignoring the wandering eye.
Assess the external ear structure and hearing, inspect the tympanic membrane (the eardrum) when indicated, and recognize signs of otitis media (a middle ear infection, behind the eardrum). Because hearing drives language, also evaluate speech and language development — a child not meeting language milestones may have a hearing problem, not a thinking problem.
Assess nasal patency (whether the nasal passages are open) and drainage, inspect the mucous membranes for hydration, evaluate dental eruption and oral health, and assess the tonsils and throat when indicated — remember, the throat exam is one of the "save for last" procedures in young children. Keep age-related differences in airway anatomy in mind: a child's airway is narrower, so the same swelling that inconveniences an adult can obstruct a child.
Children are not small adults here either. Their anatomy works against them: smaller airways (slight swelling causes major narrowing), a more compliant chest wall (soft and flexible, so it caves inward instead of helping when breathing gets hard), faster baseline respiratory rates, predominantly diaphragmatic breathing in infants (infants breathe with the diaphragm, so the belly rises and falls — this is expected), and overall increased vulnerability to airway obstruction.
Your assessment covers: respiratory rate and pattern, work of breathing (how much effort each breath takes), symmetry and chest movement, breath sounds (heard by auscultation — listening with a stethoscope), and oxygenation.
Increased work of breathing announces itself: tachypnea (breathing faster than normal for age — usually the earliest sign), nasal flaring (nostrils widening with each breath), retractions (the skin pulling inward between the ribs, under the ribs, or above the breastbone as the child fights for air), grunting (a short sound on breathing out — the child is trying to keep the air sacs open), and accessory muscle use (neck and shoulder muscles recruited to help breathe).
This is the comparison the slides test directly. For every respiratory finding, sort it into the right bucket — expected for age, or a sign of trouble:
Assess heart rate and rhythm, heart sounds and murmurs (a murmur is an extra whooshing sound caused by turbulent blood flow), peripheral pulses (pulses felt in the arms and legs), capillary refill, skin color and temperature, and activity tolerance and perfusion.
Two pediatric findings frighten students unnecessarily. Respiratory sinus arrhythmia — the heart rate speeding up slightly as the child breathes in and slowing as they breathe out — may be normal in children; it is a sign of a healthy, responsive heart, not a rhythm disorder. And innocent murmurs are common in childhood — soft murmurs in an otherwise thriving child are frequently harmless.
This is one of the highest-yield distinctions in the chapter. Early findings of impaired perfusion (blood not reaching the tissues adequately — early shock) are: tachycardia (abnormally fast heart rate — the heart compensating), cool extremities, delayed capillary refill, reduced urine output, and changes in behavior or responsiveness.
Sequence matters here: inspect the abdomen's contour, symmetry, and distention (swelling) first, then auscultate before percussion and palpation — listen with the stethoscope before you tap (percussion) or press (palpation), because pressing first can change the bowel sounds you are trying to hear. Then palpate gently for tenderness or masses, observing the child's behavior and facial expression — in a young child, the face tells you where it hurts before words do. Keep normal developmental variations in mind: a protuberant (pot-bellied) abdomen in a toddler is often normal.
Assess external genital structures when indicated and evaluate age-appropriate pubertal development — including Tanner stages, the standard scale describing the stages of puberty. Throughout, respect privacy, modesty, and autonomy, and use appropriate caregiver involvement and chaperones (a third person present for sensitive exams). Specific things to check: testicular position and symmetry, pubertal changes, any unusual discharge, lesions, or inflammation, and delayed or unusually early pubertal development — both ends of the timing spectrum warrant evaluation.
Many "odd-looking" findings in young children are simply development in progress. Normal variations: a wide-based gait (feet planted far apart for balance) in new walkers, lumbar lordosis (an inward sway of the lower back) and a protuberant abdomen in toddlers, bowlegs (genu varum) — legs curving outward at the knees — often physiologic (a normal variant, not disease) in younger toddlers, and knock-knees (genu valgum) — knees angling inward — often physiologic in preschoolers. Legs typically pass through bowlegged, then knock-kneed, then straight. An increasingly mature gait with age is expected.
Assess level of consciousness and responsiveness, muscle tone and movement, balance, gait, and coordination, sensory responses, reflexes appropriate for age, and overall developmental progress. Three key differences from adults: primitive reflexes (automatic reflexes present at birth) disappear as the nervous system matures, so a primitive reflex that persists too long is a concern; a positive Babinski response (when the sole of the foot is stroked, the toes fan upward and outward) may be normal in infancy even though it signals disease in an adult; and developmental regression (losing skills already gained) is abnormal at any age.
If you learn one table from this chapter, learn this one. The identical finding flips meaning with age:
Pull it all together by asking, of every finding: Is this normal for the child's age? Is it consistent with developmental expectations? Is it a change from the child's usual condition? Are there additional findings suggesting deterioration? Does this child need immediate intervention or further assessment?