If your newborn's skin has a yellowish tint, you're probably looking at jaundice—and you're probably worried. The good news: jaundice is the most common condition in newborns, affecting about 60% of full-term babies and 80% of preterm babies. Most cases are mild, resolve on their own, and cause no harm.
But jaundice does need monitoring, because in rare cases, very high bilirubin levels can be dangerous. Here's what you need to know.
What Causes Jaundice?
Jaundice is caused by elevated bilirubin in the blood. Bilirubin is a yellow pigment produced when red blood cells break down—a normal process that happens throughout life. Adults' livers efficiently process bilirubin and excrete it. Newborn livers are still immature and can't keep up with the volume, especially in the first few days when baby is breaking down extra red blood cells they no longer need (they had extra for life in the womb).
The result: bilirubin builds up faster than baby's liver can clear it, causing the characteristic yellow color in the skin and eyes.
Types of Jaundice
Physiologic Jaundice (Normal)
- Appears around day 2–3
- Peaks around day 3–5
- Resolves by 1–2 weeks
- Mild yellow coloring, starting on the face and progressing downward
- Baby is feeding well and behaving normally
This is by far the most common type and usually needs no treatment.
Breastfeeding Jaundice
- Occurs in the first week
- Related to inadequate milk intake (baby isn't getting enough colostrum/milk to help excrete bilirubin)
- Not caused by breast milk itself—caused by insufficient feeding
- Treatment: more frequent nursing, and sometimes supplementation to increase caloric intake
Breast Milk Jaundice
- Occurs after the first week (typically weeks 2–12)
- Baby is feeding well and gaining weight
- Caused by substances in breast milk that slow bilirubin processing
- Generally harmless and resolves on its own over weeks
- Rarely requires any intervention
Pathologic Jaundice
- Appears within 24 hours of birth (this is always concerning)
- Rises rapidly or to very high levels
- May be caused by blood group incompatibility (Rh or ABO), infection, liver problems, or other medical conditions
- Requires prompt evaluation and treatment
How Jaundice Is Assessed
Visual Assessment
Jaundice progresses from head to toe as bilirubin rises:
- Face only = mild
- Face and chest = moderate
- Extending to arms and legs = higher levels
- Palms and soles yellow = concerning
In the hospital, we check bilirubin with either:
- Transcutaneous bilirubinometer — A painless device pressed against baby's skin that estimates bilirubin
- Blood test (serum bilirubin) — A heel stick blood draw that gives a precise number
The bilirubin level is plotted against baby's age in hours on a standardized chart (the Bhutani nomogram) to determine risk level.
When to Worry
Seek Immediate Evaluation If:
- Jaundice appears within the first 24 hours of life
- Yellow color spreads to arms, legs, or the palms/soles
- Baby is difficult to wake or feed
- Baby has a high-pitched, inconsolable cry
- Baby's body appears arched or stiff
- Baby is not making enough wet/dirty diapers
- Jaundice is worsening after day 5
The Danger of Very High Bilirubin
In rare cases, extremely high bilirubin can cross into the brain (a condition called kernicterus) and cause permanent damage. This is preventable with proper monitoring and treatment. Modern screening protocols have made kernicterus extremely rare in developed countries.
Treatment
Phototherapy (Light Therapy)
The primary treatment for significant jaundice. Baby is placed under special blue lights (or on a light-emitting blanket) that help break down bilirubin in the skin so it can be excreted.
- Baby wears only a diaper and protective eye covers
- Treatment typically lasts 24–48 hours
- May be done in the hospital or with a home phototherapy unit
- Not painful—baby can still be held for feedings
Increased Feeding
Feeding more frequently helps baby excrete bilirubin through stool. This is the most important intervention for breastfeeding jaundice and supports all jaundice treatment.
- Nurse at least 8–12 times per day in the first week
- Don't skip night feedings
- If supplementation is recommended (with expressed breast milk or formula), follow your pediatrician's plan
Exchange Transfusion
In very rare, severe cases where bilirubin reaches dangerous levels despite phototherapy, a blood exchange transfusion may be needed. This is performed in a hospital setting.
Monitoring at Home
After hospital discharge, monitor for jaundice by:
- Checking skin color in natural light. Gently press on baby's forehead or nose—when you release, the underlying skin color should appear. If it looks yellow, jaundice may be present.
- Noting the progression. Jaundice that's extending from the face to the body warrants a call.
- Tracking feeding and diapers. Good feeding and adequate output (6+ wet diapers per day after day 4) support bilirubin excretion.
- Attending your scheduled follow-up. The first pediatrician visit (within 1–3 days of discharge) includes a jaundice assessment. Don't skip this appointment.
Common Questions
Does putting baby in sunlight help? Indirect sunlight can help break down bilirubin, but it's not a reliable treatment. The risk of sunburn, overheating, and UV exposure outweighs the benefit. If baby needs light therapy, medical phototherapy is safer and more effective.
Should I stop breastfeeding if baby has jaundice? Almost never. In fact, increasing breastfeeding frequency is one of the best treatments. If your provider recommends temporary supplementation, it's to increase caloric intake—not because breast milk is the problem.
Will jaundice cause brain damage? At the levels seen in normal physiologic jaundice—no. Brain damage (kernicterus) occurs only at extremely high levels that go untreated. With proper monitoring, this is preventable.
Jaundice is common, usually harmless, and highly treatable. Trust your pediatrician's monitoring plan, feed your baby frequently, and don't hesitate to call if baby looks more yellow than expected.