Jaundice in Newborns - Causes, Treatment & When to See a Doctor

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What is Jaundice in Newborns?

Jaundice is a yellow discoloration of the skin and the whites of the eyes (sclera) caused by an excess of bilirubin in the blood. In newborns, it is extremely common—affecting up to 60 % of full‑term infants and more than 80 % of premature babies within the first week of life. Bilirubin is a by‑product of the normal breakdown of red blood cells. A newborn’s liver is often immature and cannot process bilirubin as quickly as an adult’s, leading to a temporary buildup.

Most cases of neonatal jaundice are harmless and resolve on their own, but when bilirubin levels become too high, they can cross the blood‑brain barrier and cause serious neurological damage (kernicterus). Therefore, early identification and appropriate management are essential.

Common Causes

Nearly all cases of newborn jaundice are due to physiologic processes, but several other conditions can increase bilirubin production or decrease its elimination. The most frequent causes include:

• Physiologic jaundice – normal immaturity of the liver’s conjugation enzymes (Ugt1a1) and higher turnover of fetal red blood cells.
• Breast‑milk jaundice – substances in breast milk that interfere with bilirubin metabolism; typically appears after the first week.
• Breast‑feeding jaundice – inadequate intake leading to dehydration and reduced stool output, which slows bilirubin excretion.
• Hemolytic disease of the newborn (HDN) – maternal antibodies (e.g., Rh or ABO incompatibility) destroy fetal red cells.
• G6PD deficiency – an inherited enzyme defect that makes red cells more vulnerable to oxidative stress, increasing hemolysis.
• Blood group incompatibility – other minor blood‑type differences (e.g., Kell, Duffy) that trigger hemolysis.
• Infections – sepsis, urinary tract infection, or TORCH (Toxoplasmosis, Rubella, CMV, Herpes) infections can increase bilirubin production.
• Prematurity – underdeveloped liver enzymes and a higher proportion of fetal red cells.
• Cephalohematoma or extensive bruising – large amounts of blood breakdown under the skin raise bilirubin.
• Metabolic or endocrine disorders – rare conditions such as hypothyroidism or galactosemia can impair bilirubin clearance.

Associated Symptoms

While the yellow color is the hallmark sign, other findings often accompany neonatal jaundice:

• Yellowing that begins on the face and spreads downward to the chest, abdomen, and legs.
• Lethargy or excessive sleepiness.
• Poor feeding or difficulty latching.
• Decreased urine output (fewer wet diapers).
• Dark, tarry stools (indicative of higher bilirubin absorption).
• High‑pitched cry or irritability (in severe cases).
• Weight loss > 10 % of birth weight, often related to inadequate feeding.

When to See a Doctor

Newborn jaundice can progress quickly. Parents should contact a pediatrician or seek urgent care if any of the following occur:

• The yellow color appears within the first 24 hours of life (early‑onset jaundice).
• The jaundice spreads to the abdomen or legs before the infant is 3 days old.
• The infant is excessively sleepy, difficult to awaken, or not feeding well.
• There are fewer than six wet diapers in 24 hours.
• The baby’s weight is dropping or not gaining after the first few days.
• Any signs of infection (fever, lethargy, poor tone).
• Parents notice yellowing of the baby’s gums, palate, or inside of the mouth.

Prompt evaluation can prevent complications, especially in high‑risk groups such as preterm infants or those with known hemolytic disease.

Diagnosis

Clinicians combine visual assessment with laboratory measurements to determine severity and underlying cause.

1. Physical Examination

• Depth of skin discoloration (using the “bilirubin skin‐scale” or Kramer rule).
• Assessment of hydration, feeding, and neurological status.

2. Serum Bilirubin Testing

• Total serum bilirubin (TSB) – measured by a blood sample; the primary number used for treatment decisions.
• Direct (conjugated) vs. indirect (unconjugated) bilirubin – a high direct fraction suggests liver or biliary obstruction, which is less common in newborns.

3. Additional Laboratory Studies (if indicated)

• Complete blood count (CBC) and reticulocyte count – to evaluate hemolysis.
• Blood type and Coombs test – to detect maternal‑infant blood group incompatibility.
• G6PD assay – especially in populations with higher prevalence.
• Blood cultures, CRP, or viral PCR – when infection is suspected.
• Liver function tests – if conjugated hyperbilirubinemia is present.

4. Transcutaneous Bilirubinometry

A non‑invasive device that estimates bilirubin through the skin. It is useful for screening but must be confirmed with serum testing when values are high.

Treatment Options

Management is guided by the infant’s age in hours, bilirubin level, gestational age, and risk factors (e.g., hemolysis). The goals are to reduce bilirubin quickly enough to avoid neurotoxicity while maintaining adequate nutrition and hydration.

1. Phototherapy

• Standard of care for most moderate to severe cases. Blue‑green light (≈460 nm) converts bilirubin into water‑soluble isomers that can be excreted without liver conjugation.
• Types:
  • Conventional overhead units.
  • Fiber‑optic blankets or pads (useful for very low‑birth‑weight infants).
• Typical duration: 12‑48 hours, depending on response. Bilirubin levels are rechecked every 4‑6 hours.

2. Exchange Transfusion

Reserved for life‑threatening hyperbilirubinemia (usually TSB > 20 mg/dL in term infants or lower thresholds in preterms) or when phototherapy fails. Blood is removed and replaced with donor blood to rapidly lower bilirubin.

3. Intravenous Immunoglobulin (IVIG)

Used in cases of immune‑mediated hemolysis (e.g., Rh incompatibility) to block antibody‑mediated red‑cell destruction, thereby reducing bilirubin production.

4. Optimizing Feeding

• Frequent breastfeeding (8‑12 times/day) or supplemental expressed breast milk to increase stool output and bilirubin elimination.
• If intake is inadequate, temporary supplementation with formula may be advised.
• For breast‑milk jaundice, continuing breastfeeding is usually safe; phototherapy can be used while the infant’s liver matures.

5. Home Care Measures (for mild cases)

• Expose the baby to indirect sunlight for short periods (5–10 minutes) if advised by a clinician; direct UV exposure is not recommended.
• Maintain proper hydration—ensure adequate feeding.
• Track diaper output (≥ 6 wet diapers/day is a good sign).

Prevention Tips

While some degree of jaundice is inevitable, several strategies can lower the risk of severe hyperbilirubinemia:

• Early and frequent feeding – Initiate breastfeeding within the first hour after birth and nurse at least every 2‑3 hours.
• Monitor weight – Ensure the baby does not lose more than 5‑7 % of birth weight in the first week.
• Screen high‑risk infants – Premature babies, those with known blood‑type incompatibility, or a sibling with severe jaundice should have bilirubin checked before discharge.
• Avoid unnecessary formula supplementation unless the infant is truly not receiving enough breast milk.
• Education of caregivers – Teach parents to recognize early skin yellowing and the importance of regular diaper counts.
• Prompt treatment of hemolytic conditions – For mothers with known Rh‑negative status, receive Rho(D) immune globulin as recommended.

Emergency Warning Signs

Key Take‑aways

Neonatal jaundice is common and usually benign, but because bilirubin can become neurotoxic, vigilance is essential. Early feeding, routine bilirubin screening, and prompt treatment with phototherapy or, when necessary, exchange transfusion can prevent serious outcomes. Parents should never hesitate to contact a health professional if they notice rapid changes in skin color, feeding difficulties, or any of the emergency warning signs listed above.

**References**

• Mayo Clinic. “Newborn Jaundice.” accessed April 2026.
• American Academy of Pediatrics. “Management of Hyperbilirubinemia in the Newborn 2022 Update.” Pediatrics, 2022.
• National Institutes of Health (NIH). “Bilirubin Metabolism.” NCBI Bookshelf.
• World Health Organization. “Guidelines for the Management of Neonatal Jaundice.” WHO, 2021.
• Cleveland Clinic. “Neonatal Jaundice – Causes, Symptoms, and Treatment.” accessed April 2026.

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