Newborn jaundice is the yellow color that appears in a baby's skin and eyes in the first days of life. It is common and, in most babies, harmless. About half of full-term newborns and most premature newborns develop some jaundice, and it usually clears on its own. It happens because a newborn's liver takes a few days to catch up on clearing a normal substance called bilirubin. This guide covers what jaundice is, which babies need closer follow-up, how to check for it at home, how it is treated, and the specific signs that mean you should call.
What is newborn jaundice?
Jaundice is a buildup of bilirubin, a yellow substance the body makes when it breaks down old red blood cells. Before birth, the mother's liver clears bilirubin for the baby. After birth, the baby's own liver takes over, and it takes a few days to become efficient. Until it does, bilirubin can build up and tint the skin and the whites of the eyes.
Jaundice usually appears first in the face, then moves down to the chest, belly, arms, and legs as the level rises. The whites of the eyes often look yellow too. In most babies this is the normal, temporary kind of jaundice, and it is not a sign that anything is wrong with your baby.
When does jaundice appear, and when should it go away?
Most jaundice shows up on day 2 to 4, is at its highest around day 3 to 5, and fades within about two weeks. Because many babies leave the hospital before the level peaks, your baby should have a bilirubin level measured before discharge, either with a light sensor on the skin or a blood test. Before you leave, ask whether your baby's bilirubin level was normal, whether your baby needs another bilirubin check, and exactly when the follow-up visit should be. Keep that visit even if your baby looks fine. It is timed for when bilirubin is usually highest.
Two timepoints are different and matter. Jaundice in the first 24 hours of life is not the routine kind and needs a bilirubin check right away. Jaundice that is still there at two weeks old also needs to be checked, which we cover below.
This guide is about jaundice in full-term and near-term newborns. Babies born several weeks early are watched more closely and are managed differently by their care team.
Which babies need closer follow-up?
Some babies need closer jaundice follow-up than others. If any of these apply to your baby, keep every recheck and do not wait to call if something concerns you:
- Born a few weeks early, before full term.
- Significant bruising, or a soft swelling on the scalp from delivery.
- A sibling who needed light therapy for jaundice.
- A blood type difference between you and your baby, or known G6PD deficiency.
- Difficulty establishing breastfeeding, or losing more weight than your pediatrician expects.
None of these means your baby will have a problem. They mean the timing of the follow-up check matters more, because jaundice is easier to manage when it is caught early.
How do I check for jaundice at home?
You can look for jaundice, but you cannot measure it by eye. Use what you see as a reason to call, not as a test.
- Look in daylight. Natural light, such as near a window, shows the color best. Indoor lighting can hide or exaggerate it.
- Press gently on your baby's forehead or nose, then lift your finger. If the skin looks yellow where you pressed, jaundice is likely.
- Check the whites of the eyes. They often show yellow even when skin color is hard to read.
- If your baby has darker skin, jaundice is harder to see on the skin. Check the whites of the eyes, and do not rely on the skin alone.
- Notice whether it is spreading. Jaundice moves from the face downward as the level rises. Yellow reaching the belly, arms, or legs is a reason to call.
What matters more than the color
How your baby is feeding, waking, and filling diapers tells you more than the exact shade of yellow. You do not need to interpret the bilirubin number yourself. It matters because your pediatrician reads it together with your baby's age in hours, gestational age, and any risk factors, not as a number on its own. That is not something a parent can do by looking.
Watch a few concrete things in the first days:
- Feeding. Your baby should feed well and wake to feed.
- Wet diapers. These should be steady and increase over the first days.
- Stools. These should change from black and tarry at birth to greener, then to loose, seedy, and yellow.
- Weight. Some early weight loss is normal. Losing more than your pediatrician expects is a reason to call.
A baby who is feeding, stooling, and steadily wetting diapers is usually doing well even with visible jaundice. A baby who is hard to wake, feeds poorly, or makes few diapers should be seen, whatever the color looks like.
How is jaundice treated?
Most jaundice needs no treatment beyond frequent feeding. When treatment is needed, it is usually phototherapy, which is safe and effective.
- Feed often. Aim for 8 to 12 feedings a day in the first days. Frequent feeding helps your baby pass more stool and urine, which clears bilirubin from the body. If breastfeeding is hard, ask us or a lactation specialist for help early rather than waiting.
- Do not give water or sugar water. It does not lower bilirubin and can be harmful to a newborn. Milk feeds are what help.
- Phototherapy places your baby under a special light, or on a light blanket, wearing a diaper and eye protection. The light changes bilirubin into a form your baby's body can remove more easily. Phototherapy does not hurt. Babies spend much of the day under the light so it works as well as possible, with breaks for feeding and care. It is usually done in the hospital, and for some healthy babies with mild jaundice it can be done at home with a nurse checking in.
- Higher levels are treated in the hospital and, rarely, with a procedure called an exchange transfusion. This is uncommon and is used only when levels are very high.
When should I call your pediatrician?
You can call us anytime you are worried about your baby. You do not need to be sure something is wrong before you call. With a newborn, it is always reasonable to check.
Call us if:
- Your baby looks more yellow, or the yellow is spreading down to the belly, arms, or legs. The whites of the eyes often look yellow with jaundice, so what matters most is whether the yellowing is increasing or spreading.
- Your baby is feeding poorly or is hard to wake for feedings.
- Your baby has fewer wet or dirty diapers than expected, or is losing weight.
- Your baby seems more sleepy or more fussy than usual.
- Your baby is still yellow at two weeks old.
- Your baby's stools are pale, white, gray, or clay-colored, or the urine is dark. Call us right away about this one.
Jaundice that lasts past two weeks, or that comes with pale stools or dark urine, is checked with a blood test that measures direct, also called conjugated, bilirubin. Your pediatrician will usually order it to look for a liver problem rather than ordinary jaundice.
Often a short phone conversation and a look at your baby are enough to sort out whether jaundice needs a bilirubin check. Any jaundice you notice in the first 24 hours of life should be checked right away.
When is it an emergency?
Severe jaundice is rare, but it has clear warning signs. If your baby shows any of these, seek care right away:
- Hard to wake, hard to keep awake for feedings, or limp.
- Not feeding.
- A high-pitched or inconsolable cry.
- Stiffening or arching of the neck, back, or body.
- Skin that looks very yellow or orange, including the legs and feet.
These can mean bilirubin has reached a level that needs urgent treatment. Treated promptly, high bilirubin is brought down safely. The reason newborns are screened and followed so closely is to catch it well before this point.
Common myths about newborn jaundice
Sunlight treats jaundice. It does not, and it is not safe. Direct sunlight can cause sunburn and overheating. If treatment is needed, phototherapy uses a controlled, safe light instead.
Water or sugar water helps flush it out. It does not, and water can be harmful to a newborn. Frequent milk feeds are what help clear bilirubin.
You can tell how severe jaundice is by how yellow the skin looks. Skin color is a rough guide only. Only a bilirubin measurement gives the real level, and jaundice is harder to see in babies with darker skin.
Jaundice means you should stop breastfeeding. Rarely. In most cases the answer is to feed more often and get feeding support, not to stop.
Giving a little formula means breastfeeding has failed. If your baby needs extra milk for a few days, that is a case-by-case decision, and it can be expressed milk, donor milk, or formula. It does not mean the end of breastfeeding.
Jaundice is always harmless. Most is. The exceptions are jaundice in the first 24 hours, very high levels, and jaundice that lasts past two weeks. Checks and follow-up exist to catch these.
The bottom line
Newborn jaundice is common and usually harmless. The goal is not to prevent every yellow tint. It is to feed your baby well, have the bilirubin checked before you leave the hospital, keep the follow-up visit, and know the few signs that mean call. Watch how your baby feeds, wakes, and fills diapers more than you watch the shade of yellow.
The first weeks are where having a pediatrician with time matters most. At Essential Pediatrics, we keep our patient panels small so we can see your baby quickly in those early days, follow jaundice closely, and be reachable when something changes. If you are ever unsure, you call us, and you reach a doctor who knows your baby.
Frequently asked questions
Is newborn jaundice normal? Yes, in most cases. About half of full-term newborns and most premature newborns develop some jaundice in the first days of life, and it usually clears on its own within about two weeks.
When does newborn jaundice go away? Most jaundice appears on day 2 to 4, peaks around day 3 to 5, and fades within about two weeks. Jaundice that lasts longer than two weeks should be checked.
Why does the follow-up visit matter if we already left the hospital? Because bilirubin usually peaks around day 3 to 5, often after you are home. A baby who looked only mildly yellow at discharge can have a higher level a day or two later. The follow-up check is timed for that peak. Keep it even if your baby looks fine.
Does jaundice mean I have to stop breastfeeding? Almost never. There are two feeding-related types. Early jaundice is often because your baby is not getting enough milk yet, and the fix is feeding more often and getting help, not stopping. Later breast milk jaundice can last for several weeks and is usually harmless. Frequent feeding helps in both cases.
Should I give my baby water to help clear the jaundice? No. Water and sugar water do not help and can be harmful to a newborn. Frequent milk feeds are what help the body clear bilirubin.
Is phototherapy safe? Yes. Phototherapy is a safe and effective treatment. Your baby lies under a special light or on a light blanket, wearing a diaper and eye protection, and the light helps the body remove bilirubin. It does not hurt.
Can jaundice come back after phototherapy? Sometimes bilirubin rises a little again after phototherapy stops. This is common, and your pediatrician will decide whether another bilirubin check is needed. Most babies do not need treatment a second time.
My baby is still yellow at two weeks. Is that a problem? It should be checked. Most jaundice fades by two weeks. Jaundice that lasts longer, especially with pale or clay-colored stools or dark urine, needs a blood test that measures direct bilirubin to rule out a liver problem. Call us.
