In the first few days after birth, many parents notice their newborn’s skin or the whites of their eyes looking a little yellow. In most cases, this is newborn jaundice — very common, usually harmless, and treatable. But sometimes jaundice is a sign that your baby needs medical attention quickly. Knowing what to watch for makes all the difference.
What Is Newborn Jaundice?
Jaundice is caused by a build-up of bilirubin, a yellow pigment produced when red blood cells break down. Newborns make more bilirubin than adults, and their young livers are still learning to clear it — so levels rise in the blood and tint the skin and eyes yellow. This is called physiological jaundice, and it affects roughly 6 in 10 full-term babies and 8 in 10 premature babies.
It usually appears on day 2 or 3, peaks around day 4 or 5, and fades within two weeks. Breastfed babies sometimes show a milder, longer-lasting form called breast milk jaundice, which can persist for several weeks but is still generally harmless if the baby is feeding and growing well.
Signs of Normal (Physiological) Jaundice
- Yellowing starts on the face and spreads gently downward to the chest.
- Your baby is alert, feeds well, and has plenty of wet nappies and regular bowel movements.
- The yellow colour deepens slightly over days 2–5, then starts to fade.
- The whites of the eyes may look slightly yellow too.
A simple home check: press your fingertip gently on your baby’s forehead or nose, then release. If the skin looks yellow where you pressed, jaundice is present. In natural daylight this check is more reliable than under indoor lighting.
Warning Signs: When to Call the Doctor
Call your doctor, midwife, or paediatrician promptly — or go to urgent care — if you notice any of the following:
- Jaundice in the first 24 hours after birth. This is always considered early and needs same-day assessment.
- Deep or spreading yellowing — the yellow reaches the tummy, arms, or legs, or the colour looks much deeper orange than before.
- Your baby is unusually sleepy or hard to wake for feeds, or seems floppy and limp.
- Poor feeding — refusing the breast or bottle, or feeding much less than usual.
- A high-pitched cry or arching of the back and neck.
- Dark urine or pale, chalky stools — this can signal a liver or bile duct problem rather than ordinary jaundice.
- Fever alongside the yellowing.
- Jaundice lasting beyond 2 weeks in a full-term baby (or beyond 3 weeks in a premature baby).
- The yellow returns after it had already faded.
Trust your instincts: if your baby “just doesn’t seem right”, seek advice even if the jaundice looks mild. Paediatricians would always rather check a healthy baby than miss a sick one.
How Is Jaundice Checked and Treated?
Your doctor will likely do a quick, painless bilirubin test — either a small blood sample or a light-based skin reading. Treatment depends on the level and your baby’s age:
- Frequent feeding is the first line: more feeds mean more bowel movements, which is how the body clears bilirubin. Feed at least every 2–3 hours.
- Phototherapy — the baby lies under special blue lights that break bilirubin down in the skin so it can be excreted. It is painless and very effective; many hospitals now offer home phototherapy too.
- Exchange transfusion — only for very severe cases, where some of the baby’s blood is replaced to remove bilirubin rapidly.
Sunlight through a window is not an effective treatment and risks sunburn — always follow medical treatment, not home remedies.
Jaundice and Breastfeeding
Do not stop breastfeeding because of jaundice. Poor feeding makes jaundice worse, so the answer is usually more feeds, not fewer — sometimes with extra support from a lactation consultant. In rare cases of breast milk jaundice that is very prolonged, a doctor may suggest a brief pause with expressed milk, but only under medical guidance.
Most newborn jaundice resolves without any drama — but knowing the warning signs means you will never miss the moment to act. For more newborn health guides written for real parents, visit Healthy Baby Guide.
