What You Need to Know About Newborn Jaundice

CategoryPhysiology

⏱️ Reading time: 4 minutes

Medically reviewed by pediatrician Alexandra Zglavosiy

Newborn jaundice is often normal, not a disease. It usually appears on days 2–4 and fades by week 2. Frequent feeding helps; sometimes phototherapy is needed. Red flags: jaundice on day 1, low energy, poor weight gain, or fever. If symptoms worsen or last more than 2 weeks, consult a doctor.

What’s Inside

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Quick takeaways

Physiological jaundice appears in most newborns between days 2 and 4 and usually resolves on its own by 2 weeks.

Warning signs: jaundice on day 1, poor weight gain, lethargy, or fever — contact your doctor.

Treatment includes phototherapy (a safe light treatment) and more frequent feeding.

Sunlight and home remedies are not substitutes for medical care.

Physiological Jaundice Is Normal

In the first days of life, red blood cells break down rapidly. This leads to increased bilirubin — a yellow pigment processed by the liver. Since newborn livers are still immature, bilirubin may build up in the body and cause jaundice.

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Physiological jaundice is a common and normal condition that usually appears between days 2 and 4 after birth and disappears by day 7–14

  • The skin may look slightly yellow — first on the face, then the chest, belly, and legs
  • Mucous membranes may also be yellow — such as the gums or the whites of the eyes
  • Most cases are mild and resolve without treatment
  • About 5% of newborns may have pathological jaundice, which is caused by infections, blood incompatibility, or liver issues and requires medical care

Persistent jaundice symptoms require medical attention

Contact your pediatrician if your baby shows any of the following symptoms:

  • Jaundice in the first 24 hours of life
  • Yellowing that worsens after day 4 or comes back later
  • Wave-like or fluctuating jaundice
  • The baby is very sleepy or fussy, feeds poorly, or is not gaining weight
  • Rash, fever, trouble breathing, dark urine, or pale-colored stool
  • Jaundice that lasts longer than 2 weeks
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If yellowing gets worse instead of better, contact your doctor promptly

Phototherapy and Feeding Help Lower Bilirubin

Treatment is often not needed. Physiological jaundice resolves naturally as the baby’s liver matures. Parents should simply watch for symptoms and monitor the baby’s condition.

In some cases, the doctor may recommend:

  • Phototherapy — the most common treatment. The baby is placed under a special blue light that helps break down bilirubin through the skin. This method is safe and does not cause burns.
  • More frequent feeding — to help flush bilirubin out of the body through urine and stool.

Common Questions About Newborn Jaundice

— Can jaundice be prevented?

Not usually — it’s a natural part of adaptation after birth. But it’s important to monitor your baby closely in the first few days.

— How long does jaundice last?

Physiological jaundice usually disappears by 7–14 days. If it lasts longer, consult your doctor.

— What should I do if jaundice doesn’t go away?

If yellowing persists or worsens, contact your pediatrician. They may order additional tests and recommend treatment if needed.

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With care

Our articles are based on evidence-based medicine and reviewed by pediatricians. However, they do not replace a consultation with your doctor. Every child is unique — if you have any concerns, please consult a medical professional.

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Sources

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  • Tsujimoto Y, Miki S, Shimada H, Tsujimoto H, Yasuda H, Kataoka Y, Fujii T. Non‐pharmacological interventions for preventing clotting of extracorporeal circuits during continuous renal replacement therapy. Cochrane Database of Systematic Reviews 2021, Issue 9. Art. No.: CD013330. DOI: 10.1002/14651858.CD013330.pub2. https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD013330.pub2/full. Accessed 01 April 2025.