Newborn Jaundice: When It Is Normal and When It Is Not
Jaundice affects around 60 percent of term and 80 percent of preterm babies in the first week. Most of it is harmless and resolves on its own. A small proportion is dangerous, and the features that separate the two are worth knowing precisely, because untreated severe jaundice causes permanent brain damage.
Why it happens
Bilirubin is produced when red blood cells break down. Newborns have more red cells, those cells have a shorter lifespan, and the immature liver processes bilirubin slowly. Bilirubin rises, deposits in the skin, and the baby looks yellow.
Yellowing progresses from the head downward as levels rise, which is why involvement of the palms and soles is a warning sign.
Physiological jaundice, the common kind
- Appears after 24 hours, usually on day two or three
- Peaks around days three to five in term babies, later in preterm
- Fades by one to two weeks
- The baby feeds well, is alert, passes normal urine and stool, and gains weight
This needs observation and good feeding, not treatment, unless levels cross treatment thresholds.
Breastfeeding-associated jaundice
Two different things, often confused:
Suboptimal intake jaundice, in the first week, caused by insufficient milk intake. Less milk means less stooling, and bilirubin is reabsorbed from the gut. The answer is more effective feeding, not less. Stopping breastfeeding is the wrong response.
Breast milk jaundice, appearing in the second week and sometimes persisting for several weeks in a thriving, well baby. Generally benign, but prolonged jaundice always needs tests to exclude other causes rather than being assumed.
Warning signs needing same-day medical assessment
- Jaundice in the first 24 hours of life. Always abnormal, always urgent
- Yellow reaching the palms and soles
- Deep orange or greenish tinge
- Jaundice persisting beyond 14 days in a term baby, or 21 days in a preterm baby
- Pale, chalky or clay-coloured stools, with dark urine. This suggests biliary atresia, a surgical condition where the outcome depends heavily on operating early, ideally within the first two months. Newborn urine should be almost colourless, and newborn stools should be yellow
- Poor feeding, sleepiness, difficulty waking
- High-pitched cry
- Arching of the back and neck, stiffness, or floppiness
- Fever, vomiting
- Poor weight gain or weight loss beyond 10 percent
- Any jaundice in a baby who is preterm, has a bruise or cephalhaematoma, has an incompatible blood group with the mother, or has a sibling who needed phototherapy
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Causes beyond the physiological
- Rh or ABO blood group incompatibility causing haemolysis
- G6PD deficiency, common in parts of India, in which certain drugs, infections and foods including fava beans trigger severe haemolysis
- Hereditary spherocytosis and other red cell disorders
- Infection, including sepsis and urinary infection
- Bruising or cephalhaematoma from delivery
- Hypothyroidism
- Biliary atresia and other liver conditions
- Galactosaemia and other metabolic disorders
- Polycythaemia
Assessment
Visual estimation is unreliable, particularly on darker skin. Jaundice is measured with a transcutaneous bilirubin meter or a serum bilirubin blood test, and the value is plotted on a chart against the baby’s age in hours and gestational age. The same number means very different things at 24 hours and at 96 hours, which is why the exact age matters.
Further tests when indicated: blood group of mother and baby, direct Coombs test, complete blood count and reticulocytes, G6PD assay, thyroid function, and split bilirubin to separate conjugated from unconjugated, which distinguishes liver and bile duct causes.
Treatment
Phototherapy is the mainstay. Blue light converts bilirubin into a form excreted without liver processing. The baby is undressed under the lights with eyes shielded, feeding continues, and levels are rechecked. It is safe and effective.
Exchange transfusion for very high levels or rapid rise, replacing the baby’s blood to remove bilirubin and antibodies quickly.
Intravenous immunoglobulin in some immune haemolytic cases.
Treating the cause: antibiotics for infection, surgery for biliary atresia, thyroid treatment.
Adequate feeding throughout, since milk intake drives bilirubin excretion.
Sunlight is not treatment
Placing a newborn in sunlight is widely advised and should not be relied on. The wavelengths are not controlled, the effective dose cannot be judged, and the real risks are sunburn, dehydration, overheating and hypothermia from undressing the baby near a window in cold weather. Most importantly, it creates false reassurance while levels keep climbing.
If a baby needs light treatment, that treatment is phototherapy in a hospital.
Kernicterus
The reason all of this matters. Very high bilirubin crosses into the brain and causes permanent damage: cerebral palsy, hearing loss, abnormal eye movements and intellectual disability. It is almost entirely preventable with timely measurement and phototherapy, and it still occurs where jaundice is managed at home by eye.
Practical guidance for parents
Check the baby in good natural daylight, pressing gently on the nose, chest, abdomen, then palms and soles, and look at the whites of the eyes. Attend the newborn check-up at 48 to 72 hours after discharge. Feed frequently, 8 to 12 times a day. Count wet nappies and note stool colour. If in doubt, ask for a bilirubin measurement rather than an opinion.
This is general information. Jaundice in the first 24 hours, pale stools, or any unwell newborn is an emergency; seek immediate medical care rather than observing at home.