Newborn Jaundice: Bilirubin Testing and Treatment Options

Newborn jaundice is a common condition in the first days of life, caused by a buildup of bilirubin that makes the skin and eyes look yellow. Most babies do well with careful monitoring, feeding support, and treatment such as phototherapy when needed.

Overview

Newborn jaundice is the yellow coloring of a baby’s skin and the whites of the eyes caused by bilirubin, a yellow pigment made when red blood cells naturally break down. Before birth, the mother’s liver helps process bilirubin for the baby. After birth, the newborn’s liver takes over, and it may need a few days to work efficiently.

Many healthy newborns develop some degree of jaundice in the first week of life. This is often called physiologic jaundice, meaning it is related to normal newborn changes. It commonly appears after the first 24 hours, peaks over the next few days, and improves as feeding becomes established and the liver matures.

Jaundice is usually mild, but bilirubin levels can sometimes rise higher than expected. Because very high bilirubin needs timely treatment, maternity teams routinely check babies for jaundice before discharge and advise parents when follow-up testing is needed. The goal is early detection, safe treatment, and reassurance for families.

Symptoms and What Parents May Notice

The main sign of newborn jaundice is a yellow tint to the skin. It may first be seen on the face and then move down to the chest, abdomen, arms, and legs as bilirubin rises. In babies with darker skin tones, jaundice may be easier to notice in the whites of the eyes, gums, or the skin of the palms and soles.

Parents may also notice that the baby seems sleepier than expected or is not feeding as well. Some babies with jaundice are otherwise active, waking for feeds and having normal wet and dirty diapers. Because appearance alone cannot accurately show the bilirubin level, a bilirubin test may be recommended even when a baby looks well.

Medical advice is especially important if jaundice appears within the first 24 hours of life, becomes more noticeable quickly, or is associated with poor feeding, fewer wet diapers, unusual limpness, a high-pitched cry, fever, or difficulty waking. These signs do not always mean a serious problem, but they should be checked promptly by a qualified clinician.

Causes and Risk Factors

Most newborn jaundice happens because babies produce more bilirubin than older children and adults, while their liver is still developing the ability to process it. Bilirubin leaves the body mainly through stool and urine, so feeding and digestion play an important role. Babies who are not taking enough milk in the first days may have less stool output, allowing bilirubin to build up.

Some babies have a higher chance of significant jaundice. Risk factors include being born before 38 weeks, significant bruising from birth, a previous sibling who needed treatment for jaundice, blood type incompatibility between mother and baby, and certain inherited red blood cell conditions. Babies of East Asian or Mediterranean ancestry may also have a higher risk in some settings.

Breastfeeding is healthy and strongly supported, but two breastfeeding-related patterns can be associated with jaundice. Early breastfeeding jaundice can occur when milk intake is low before breastfeeding is fully established. Breast milk jaundice, a different and usually harmless pattern, may appear after the first week and last longer while the baby otherwise feeds and grows well.

Less commonly, jaundice may be related to infection, thyroid problems, liver or bile duct conditions, or other medical issues. Jaundice with pale stools, dark urine, poor weight gain, or a direct bilirubin elevation needs further evaluation. Doctors consider the baby’s age in hours, overall condition, birth history, and bilirubin type when deciding the cause and next steps.

Bilirubin Testing: How Levels Are Checked

Bilirubin testing helps clinicians decide whether a baby needs observation, repeat testing, or treatment. The bilirubin level is interpreted based on the baby’s age in hours, gestational age, and risk factors. A value that is acceptable for an older full-term baby may require closer attention in a younger or premature baby.

A transcutaneous bilirubin test, often called TcB, uses a handheld device placed gently on the baby’s skin. It is quick, painless, and useful for screening. If the reading is high, close to a treatment threshold, or if the baby has particular risk factors, a blood test is usually used to confirm the level.

A total serum bilirubin test, or TSB, measures bilirubin from a small blood sample. It is the standard test used to guide treatment decisions. Doctors may also measure direct and indirect bilirubin. Indirect bilirubin is the common type in typical newborn jaundice, while elevated direct bilirubin may suggest a liver or bile flow problem that needs separate assessment.

Before a newborn goes home, parents are usually told whether follow-up is needed and when it should happen. Follow-up may be within a day or two for babies who are younger at discharge, premature, visibly jaundiced, feeding less well, or near a treatment threshold. Keeping these appointments is an important part of safe newborn care.

Treatment Options

Treatment depends on the bilirubin level, the baby’s age, gestational age, and overall health. Many babies need only regular feeding, monitoring, and follow-up testing. Parents should not place a newborn in direct sunlight as a treatment, because this can cause overheating or sunburn and does not provide the controlled care that medical phototherapy provides.

Phototherapy is the most common treatment for high bilirubin. The baby is placed under special blue-spectrum lights or on a light-emitting blanket while wearing eye protection if overhead lights are used. The light changes bilirubin into a form that can leave the body more easily through urine and stool. Nurses and doctors monitor the baby’s temperature, hydration, feeding, and bilirubin levels during treatment.

Feeding support is often part of jaundice care. For breastfed babies, this may include help with latch, feeding frequency, milk transfer, and weight monitoring. In some cases, expressed breast milk or temporary supplementation may be recommended by the care team, depending on the baby’s hydration, weight loss, and bilirubin level. The aim is to support the baby’s health while preserving breastfeeding whenever possible.

Rarely, if bilirubin rises very high or is increasing quickly despite phototherapy, additional treatments may be needed. Intravenous immunoglobulin may be considered for certain immune-related blood type incompatibilities. Exchange transfusion, in which the baby’s blood is carefully replaced in a specialist setting, is reserved for severe cases. These advanced treatments are uncommon but available when clinically necessary.

Prevention and Self-Care at Home

Not all newborn jaundice can be prevented, but good early feeding and follow-up reduce the chance that bilirubin will rise unnoticed. Newborns usually need frequent feeds, and parents should follow the feeding plan provided by their maternity team. Wet and dirty diapers, weight checks, and the baby’s alertness help clinicians assess whether feeding is going well.

Parents can check for jaundice in natural light by looking at the baby’s face, chest, eyes, gums, palms, and soles. Pressing gently on the skin for a moment may make yellowing easier to see. However, skin checks are only a guide; they do not replace bilirubin testing when a doctor or midwife recommends it.

At home, parents should avoid giving water, sugar water, herbal remedies, or over-the-counter products to treat jaundice unless specifically advised by a doctor. Newborns have sensitive fluid and metabolism needs, and unapproved remedies can interfere with safe care. The best home steps are feeding support, monitoring diapers, attending follow-up appointments, and asking for help early if concerns arise.

When to See a Doctor

Parents should contact a healthcare professional if jaundice appears in the first 24 hours after birth, if the yellow color spreads or deepens, or if the baby is difficult to wake, feeding poorly, or producing fewer wet or dirty diapers. Prompt advice is also needed if the baby has a fever, seems unusually floppy, has a high-pitched cry, or behaves in a way that worries the parents.

Medical evaluation is also important if jaundice lasts longer than expected. In many breastfed babies, mild jaundice can persist for several weeks while the baby remains well. Even so, prolonged jaundice should be assessed to confirm that growth, feeding, stool color, urine color, and bilirubin type are appropriate.

Families should keep the discharge plan and bilirubin follow-up schedule provided by the birth hospital or pediatric team. If a baby was born early, had bruising, has a blood type incompatibility, or had a bilirubin level near a treatment threshold, follow-up may be needed sooner. Acibadem International’s multidisciplinary pediatric and neonatal specialists, within JCI-accredited hospitals, can evaluate and treat newborn jaundice for international patients when specialist care is required.

Frequently asked questions

Is newborn jaundice normal?

Yes, mild jaundice is very common in newborns, especially during the first week of life. It usually happens because the baby’s liver is still maturing. A clinician may still recommend bilirubin testing to make sure the level is safe.

How is bilirubin tested in a newborn?

Bilirubin can be screened with a painless skin device called a transcutaneous bilirubin meter. If the result is high or the baby has risk factors, a small blood sample is used to measure total serum bilirubin. Blood testing is the main method used to decide whether treatment is needed.

Does phototherapy hurt the baby?

Phototherapy does not hurt the baby and is widely used for newborn jaundice. The baby may wear eye protection under overhead lights, and the care team monitors temperature, hydration, and bilirubin levels. Parents can usually continue feeding and comforting the baby during treatment breaks as advised.

Can sunlight treat newborn jaundice?

Direct sunlight is not recommended as a treatment for newborn jaundice. It is not controlled like medical phototherapy and may cause overheating or sunburn. If bilirubin is high enough to need treatment, supervised phototherapy is the safer option.

Should breastfeeding stop if a baby has jaundice?

Breastfeeding usually continues, and support with latch and feeding frequency can be very helpful. In selected cases, a doctor may recommend expressed breast milk or temporary supplementation based on the baby’s weight, hydration, and bilirubin level. Parents should make feeding changes with guidance from a qualified healthcare professional.

When is newborn jaundice urgent?

Jaundice should be checked promptly if it appears in the first 24 hours, becomes more intense quickly, or is linked with poor feeding, unusual sleepiness, fever, or fewer wet diapers. These signs need medical assessment to decide whether testing or treatment is required. Early care helps keep treatment simple and effective.

References

• American Academy of Pediatrics
• World Health Organization
• National Institute for Health and Care Excellence
• Centers for Disease Control and Prevention
• Merck Manual Professional Edition

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.