Newborn Jaundice: Why Babies Turn Yellow and When to Worry

You've just brought your baby home and suddenly notice their skin looks yellow. It can be alarming. But newborn jaundice is one of the most common conditions we see in the first week of life — and in most cases, it is completely normal and manageable.

What Is Newborn Jaundice?

Jaundice means the skin and the whites of the eyes turn yellow. In newborns, it happens because of a substance called bilirubin — a yellow pigment produced when red blood cells break down.

Newborn babies have more red blood cells than adults, and their livers are still maturing and cannot process bilirubin quickly enough. So bilirubin builds up in the blood, causing the yellow colour.

Is It Normal?

Yes — most of the time. Around 60% of full-term babies and 80% of premature babies develop some jaundice in the first week. This is called physiological jaundice and usually appears on day 2–3, peaks around day 4–5, and clears by week 2.

However, not all jaundice is harmless. Some types need monitoring and treatment — and this is why every newborn should be checked.

Warning Signs: When to See a Doctor the Same Day

• Jaundice that appears in the first 24 hours of life — always needs evaluation
• Yellow colour spreading to the belly, arms, and legs (beyond just the face)
• Baby is very sleepy and difficult to wake for feeds
• Baby is not feeding well or has very few wet nappies
• Dark yellow or orange urine (should be pale yellow in a newborn)
• Pale or white-coloured stools
• Jaundice that persists beyond 2 weeks in a full-term baby

If you notice any of these signs, bring your baby to a paediatrician that same day. Do not wait.

How Is Jaundice Measured?

We use a device called a transcutaneous bilirubinometer (TcB) — placed on the baby's skin to check bilirubin levels quickly and painlessly. If the reading is elevated, we do a blood test to confirm the level and decide whether treatment is needed.

We follow the IAP and AAP Bhutani nomogram — a chart that compares the bilirubin reading against the baby's age in hours to determine the safe threshold for that specific baby.

Treatment: What Phototherapy Does

The main treatment for newborn jaundice is phototherapy — placing the baby under a special blue light. The light converts bilirubin in the skin into a form that the baby can excrete through stool and urine.

• The baby's eyes are protected with eye shields during phototherapy
• Baby is fed frequently (every 2–3 hours) to help clear bilirubin faster
• Bilirubin levels are rechecked with regular blood tests
• Most babies need phototherapy for 1–3 days before levels drop to safe range

What Can Parents Do at Home?

Frequent feeding is the single most helpful thing. Breast milk or formula helps the gut move, which removes bilirubin from the body. Aim for at least 8–12 feeds in 24 hours.

Sunlight is sometimes suggested, but it is not a reliable or safe treatment on its own — babies can overheat or get sunburned. Never delay proper medical review in favour of sunlight exposure.

Why Timely Treatment Matters

If very high bilirubin levels are left untreated, bilirubin can cross into the brain and cause kernicterus — permanent brain damage affecting movement and hearing. This is a preventable condition. A quick check at the clinic takes just a few minutes and gives you the confidence that your baby is safe.

"Jaundice is common, but never ignore it. One bilirubin reading at the clinic can tell us everything we need to know — and most parents leave reassured."

Dr. Sushma B at Sri Anand Child and Neuro Center, Chanda Nagar provides same-day bilirubin testing and phototherapy for newborns. Emergency consultations available 24/7 — call +91 90633 66983. Serving families from Ameenpur, Miyapur, Lingampally, Bachupally and all of western Hyderabad.

Medically reviewed by Dr. Sushma B, DNB Paediatrics · Fellowship PICU (IDPCCM). Follows IAP and AAP neonatal jaundice management guidelines.