You've brought your baby home, and a few days later their skin looks a little yellow. It's one of the most common things new parents notice — and in most babies, it's harmless and settles on its own. Here's what to understand and when to act.

What causes newborn jaundice?

Jaundice is the yellow tint that appears when a substance called bilirubin builds up in the blood. Bilirubin is produced naturally as old red blood cells break down. A newborn's liver is still maturing and clears it slowly, so levels rise in the first days of life.

This is so common that it affects a majority of newborns to some degree, and even more babies born before their due date.

When it appears — and when it fades

• Physiological jaundice — the usual kind. Appears around day 2 or 3, peaks around day 4 or 5, and fades over the following one to two weeks.
• Breastfeeding jaundice — occurs in the first week when a baby isn't yet feeding enough. Improves as feeding is established.
• Breast milk jaundice — appears later, around the second week, and can linger for several weeks while the baby remains perfectly healthy and growing.
• Jaundice needing investigation — appears within the first 24 hours, rises quickly, or persists beyond two to three weeks.

How to check at home

In good natural daylight, press gently on your baby's forehead or the tip of the nose. When you lift your finger, the skin will briefly look pale — if it looks yellow instead, jaundice is present. Check the chest, tummy, arms and legs too.

Jaundice spreads from head downwards, so yellowing that has reached the tummy, thighs or feet suggests higher levels and should be checked by your pediatrician the same day.

How jaundice is assessed and treated

Your pediatrician will examine your baby and may check bilirubin levels — either with a small skin-sensor device or a blood test. The level is interpreted alongside your baby's age in hours, weight and any risk factors, which is why a number alone doesn't tell the whole story.

• Mild jaundice — usually needs only good feeding and follow-up checks
• Moderate jaundice — treated with phototherapy, where special blue light helps the body break down bilirubin. It's safe, painless and widely used.
• Severe or rapidly rising levels — need hospital care and closer monitoring

Treated appropriately and in time, jaundice resolves without any lasting effect. The risk comes only from very high levels left unmonitored — which is exactly why early check-ups matter.

What not to do

• Don't place your baby in direct sunlight. This is a widespread belief, but sunlight is not a treatment — newborn skin burns easily and babies overheat quickly. Phototherapy uses a specific, controlled wavelength that sunlight does not safely provide.
• Don't give water, glucose water or gripe water. These reduce milk intake and can worsen jaundice. Breast milk or formula only.
• Don't stop breastfeeding unless your pediatrician specifically advises it.
• Don't rely on home remedies or wait to see if it fades. Bilirubin levels need proper assessment.

Your baby's first check-ups

Because jaundice usually peaks around day 4 or 5 — often after you've gone home — an early newborn visit is important. We recommend a check within the first week, and sooner if you notice any yellowing. Read more about our newborn care service, which covers jaundice screening, feeding support and growth monitoring.

Medical disclaimer: This article is for general information and parent education only. It is not medical advice and does not replace an in-person consultation. If you are worried about your child's health, please contact your pediatrician or call us on +91-9000339933.