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Jaundice in Newborns

What is Jaundice in Newborn?

Jaundice is a yellow discoloration of the skin, sclera (the whites of the eyes), and sometimes the mucous membranes that occurs when there is an excess of bilirubin in the bloodstream. In newborns, this condition is extremely common—affecting up to 60 % of term infants and more than 80 % of pre‑term infants during 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 less able to process bilirubin efficiently, which can cause a temporary buildup. Most cases are benign and resolve without long‑term problems, but very high levels can cross the blood‑brain barrier and cause permanent neurologic injury (kernicterus).

Common Causes

Jaundice in the newborn period is usually categorized as physiologic (normal) or pathologic (due to an underlying condition). Below are the most frequently encountered causes.

• Physiologic jaundice – Immature liver enzymes leading to slower bilirubin clearance; peaks around days 2‑4 in term infants.
• Breast‑milk jaundice – Certain substances in breast milk can inhibit bilirubin conjugation; usually appears after the first week.
• Breast‑feeding failure jaundice – Inadequate milk intake → dehydration and reduced bilirubin excretion.
• Hemolytic disease of the newborn (e.g., ABO or Rh incompatibility) – Accelerated red‑cell breakdown.
• Blue‑baby syndrome (methemoglobinemia) – Exposure to nitrate‑containing water or certain drugs.
• G6PD deficiency – Enzyme deficiency that predisposes red cells to oxidative damage.
• Congenital infections – TORCH infections (Toxoplasmosis, Rubella, Cytomegalovirus, Herpes) can impair liver function.
• Structural liver disease – Biliary atresia, choledochal cysts, or neonatal hepatitis.
• Metabolic disorders – Crigler‑Najjar syndrome, hypothyroidism, or galactosemia.
• Medications/toxins – Certain antibiotics (e.g., sulfonamides), NSAIDs, or maternal medications transferred via breast milk.

Associated Symptoms

While many newborns with jaundice look otherwise well, several other signs may accompany the yellow discoloration, especially when the underlying cause is pathologic.

• Lethargy or excessive sleepiness
• Poor feeding or difficulty latching
• High‑pitched crying
• Vomiting or poor weight gain
• Dark (tea‑colored) urine
• Pale, chalky stools (suggesting cholestasis)
• Enlarged liver or spleen on examination
• Presence of a rash, hemolysis (pallor), or bruising
• Fever or signs of infection

When to See a Doctor

Newborn jaundice progresses quickly, and early evaluation is essential. Contact your pediatrician or go to an urgent care facility if you notice any of the following:

• Yellowing that spreads beyond the face to the chest, abdomen, or legs.
• Jaundice appearing within the first 24 hours of life (especially in term infants).
• Baby is feeding poorly, losing weight, or appears unusually sleepy.
• Skin appears very yellow (deep “straw‑colored” hue) or the sclera are markedly yellow.
• Any accompanying symptoms listed above (e.g., fever, vomiting, pale stools).
• Your baby was born premature (<37 weeks) or has a known blood‑type incompatibility.

Diagnosis

Evaluation of newborn jaundice involves a combination of visual assessment, laboratory testing, and occasionally imaging.

1. Clinical assessment

• **Kramer rule** – Estimation of serum bilirubin based on the cephalocaudal spread of skin discoloration (arms, chest, abdomen, thighs, legs).
• Measurement of the infant’s weight, feeding patterns, and vitals.

2. Laboratory tests

• Serum total bilirubin (TB) – Primary test; levels are plotted on age‑specific nomograms to determine risk.
• Direct (conjugated) bilirubin – Helps differentiate between unconjugated (most common) and conjugated (cholestatic) jaundice.
• Complete blood count (CBC) and peripheral smear – Detect hemolysis or G6PD deficiency.
• Blood type and Coombs test – Assess for ABO/Rh incompatibility.
• Liver function panel – ALT, AST, GGT, alkaline phosphatase.
• Thyroid‑stimulating hormone (TSH) and free T4 – Screen for hypothyroidism if indicated.

3. Additional studies (if indicated)

• Abdominal ultrasound – Evaluates biliary tree for atresia or obstruction.
• Screening for infections (e.g., TORCH serologies) when maternal or neonatal infection is suspected.
• Genetic/metabolic testing for rare enzyme deficiencies.

Treatment Options

Therapy focuses on lowering bilirubin levels safely while addressing the underlying cause. The approach varies with the infant’s age, bilirubin concentration, and overall health.

1. Phototherapy

Most common and effective treatment for bilirubin levels that exceed age‑specific thresholds. Blue‑green light (≈460 nm) converts bilirubin into water‑soluble isomers that can be excreted without conjugation.

• Conventional overhead lamps or LED blankets.
• Intensity is measured in µW/cm²/nm; higher intensity shortens treatment time.
• Typically continued until bilirubin falls below the treatment line on the nomogram.

2. Exchange transfusion

Reserved for critically high bilirubin levels (>20–25 mg/dL in term infants) or when phototherapy fails. Blood is removed and replaced with donor blood to rapidly lower bilirubin and correct hemolysis.

3. Intravenous immunoglobulin (IVIG)

Used in cases of hemolytic disease of the newborn due to ABO/Rh incompatibility; IVIG can reduce the need for exchange transfusion.

4. Enhancing feeding

• Frequent breastfeeding (at least 8–12 times/day) or supplemental formula to promote hydration and bowel movements, which aid bilirubin excretion.
• Lactation consultant support if breastfeeding difficulties are identified.

**Home care measures** (for mild, physiologic jaundice):

• Ensure adequate feeding – aim for 60–90 ml/kg/day of breast milk or formula.
• Expose the baby to natural indirect sunlight for short periods (10‑15 min, avoiding direct eye exposure). This can modestly lower bilirubin but should not replace medical therapy.
• Maintain a warm, well‑ventilated environment; avoid overheating.

Prevention Tips

While physiologic jaundice is unavoidable, many steps can lower the risk of severe or prolonged jaundice.

• Early and frequent feeding – Initiate breastfeeding within the first hour after birth and continue regularly.
• Monitor weight – Ensure the newborn is gaining at least 20–30 g/day after the first 48 hours.
• Check bilirubin levels – Many hospitals perform a bilirubin screen before discharge, especially for high‑risk infants.
• Maternal health – Treat maternal diabetes, hypertension, or infections promptly, as these can increase infant jaundice risk.
• Awareness of blood‑type incompatibility – If the mother is O‑negative or has a different Rh status, prenatal counseling and post‑natal monitoring are essential.
• Avoid over‑use of certain drugs – Discuss any maternal or infant medication (e.g., sulfonamides, certain antibiotics) with the pediatrician.
• Proper storage of formula – Prevent bacterial contamination that could cause infection‑related jaundice.

Emergency Warning Signs

Key Take‑aways

Jaundice is one of the most common reasons parents bring newborns to the doctor. Most cases are “physiologic” and resolve with simple measures such as feeding and phototherapy. However, because very high bilirubin can cause irreversible brain damage, early detection and treatment are crucial. Parents should track feeding patterns, watch for the spread of yellow color, and never hesitate to contact a healthcare professional if they notice any warning signs.

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References:

• Mayo Clinic. Newborn Jaundice. Accessed May 2026.
• American Academy of Pediatrics. Management of Hyperbilirubinemia in the Newborn, 2022.
• National Institute of Child Health and Human Development (NICHD). Jaundice in Neonates. Updated 2023.
• Cleveland Clinic. Neonatal Jaundice. 2024.
• World Health Organization. Jaundice in Newborns. 2023.

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