My Newborn Is Yellow - Is This Jaundice and When Is It Dangerous?
What causes newborn jaundice, bilirubin levels explained, phototherapy at Singapore hospitals, and when to go to A&E immediately.
What Causes Newborn Jaundice?
Jaundice in newborns is caused by a build-up of bilirubin - a yellow pigment produced when red blood cells break down. Newborns have more red blood cells than adults and their livers are still maturing, so they cannot process bilirubin as quickly. The result is a yellowish tinge to the skin and whites of the eyes.
About 60% of full-term newborns and 80% of preterm babies develop some degree of jaundice. In Singapore, jaundice screening is standard during the hospital stay. Babies are typically discharged with a transcutaneous bilirubin (TcB) reading taken before leaving KKH, NUH, or TMC.
| Type | When It Appears | Cause | Severity |
|---|---|---|---|
| Physiological Jaundice | Day 2-3 | Normal newborn RBC breakdown; immature liver | Mild - Usually resolves by day 10-14 |
| Breast Milk Jaundice | Week 1-2, peaks week 2-3 | Substances in breast milk slow bilirubin breakdown | Moderate - Usually self-limiting by 3-12 weeks |
| Breastfeeding Jaundice | Day 2-5 | Insufficient milk intake causes dehydration; bilirubin concentrates | Moderate - Treated by increasing feeds |
| Pathological Jaundice | Within 24 hours of birth | Blood group incompatibility (ABO/Rh), infection, G6PD deficiency | Potentially serious - Needs urgent treatment |
Important for Singapore families: G6PD (glucose-6-phosphate dehydrogenase) deficiency is more common in Singapore - affecting about 3% of newborns, especially Chinese males. G6PD-deficient babies are at higher risk of severe jaundice. All babies born in Singapore are screened for G6PD before discharge.
How to Assess Jaundice at Home - Kramer Zones
Jaundice spreads in a predictable pattern from head to toe as bilirubin levels rise. You can do a quick visual check at home by pressing gently on the skin with a finger, releasing, and seeing if the skin looks yellow. Check in natural light (not under yellow-tinted lights).
Zone 1 - Face and forehead: Mild jaundice. Usually does not need treatment for healthy term babies.
Zone 2 - Upper chest and trunk: Moderate. Monitor closely; blood bilirubin test recommended.
Zone 3 - Abdomen below navel: Increasing concern. Likely needs phototherapy treatment.
Zone 4 - Arms and legs: High bilirubin. Needs urgent assessment today.
Zone 5 - Palms and soles: Very high bilirubin. Go to A&E immediately.
Kramer's rule is a visual guide only. Bilirubin levels must be confirmed with a blood test for clinical decisions. Do not delay seeking help based solely on this assessment.
Phototherapy - How Singapore Hospitals Treat Jaundice
Phototherapy (bili lights) is the main treatment for jaundice. Blue-spectrum light breaks down bilirubin in the skin, so it can be excreted. It is safe and effective.
Hospital Phototherapy
Baby is placed under a special light source in a clear cot with eyes covered (phototherapy eye mask). Baby should be undressed as much as possible to maximise skin exposure. Feeds are continued - frequent feeding helps flush bilirubin through the gut. Treatment is usually 24-48 hours.
Home Bili Blankets
For mild-to-moderate cases, some Singapore hospitals and paediatric clinics offer home phototherapy with a fibre-optic bili blanket (e.g., from KKH's Home Care programme). Baby lies on the blanket pad. This allows mum and baby to stay together and continue breastfeeding.
Go to A&E Immediately If:
- - Jaundice appears within 24 hours of birth
- - Yellow colour has spread to palms and soles
- - Baby is very difficult to wake, floppy, or feeding very poorly
- - Baby has a high-pitched unusual cry
- - Baby has dark brown urine and pale white or grey stools (possible biliary atresia - a medical emergency)
Breast Milk Jaundice vs Breastfeeding Jaundice - What Is the Difference?
These two types of jaundice are often confused, but they have different causes and treatments. Do not stop breastfeeding for jaundice without discussing it with your doctor first.
Breast Milk Jaundice
- - Appears in week 2 onward
- - Baby is feeding well, gaining weight, good nappy output
- - Caused by a substance in mature breast milk that slows bilirubin breakdown
- - Usually resolves by 3-12 weeks with continued breastfeeding
- - Rarely needs treatment
Breastfeeding Jaundice
- - Appears in first 5 days
- - Baby is NOT feeding well - poor latch, insufficient intake
- - Caused by dehydration concentrating bilirubin
- - Treatment: increase feeding frequency, improve latch, sometimes temporary supplementation
- - See a lactation consultant urgently