If your baby is two weeks old and the skin or the whites of the eyes still look yellow, it’s natural to worry. Newborn jaundice is common and usually fades on its own, but when it lingers, a simple test may be needed to find out why, so it helps to know the benchmarks.
Why It Happens
Jaundice is the yellow color that appears when a substance called bilirubin builds up in the blood. According to HealthyChildren.org from the American Academy of Pediatrics, a newborn’s liver takes a few days to get better at clearing bilirubin, which is why many babies turn yellow in the first days of life, and physiologic jaundice typically peaks around day 4 or 5. Korean pediatric sources distinguish this from pathologic jaundice, described as jaundice seen on the first day of life, very high levels, jaundice lasting 2 weeks or more, or a rise in direct bilirubin.
How It Looks at Different Ages and Stages
In formula-fed babies, most jaundice goes away by about 2 weeks. In breastfed babies it’s common for jaundice to last about a month, sometimes longer. The AAP guideline recommends measuring both total and direct (conjugated) bilirubin in formula-fed infants who are still jaundiced at 2 weeks and in breastfed infants who are still jaundiced at 3 to 4 weeks. A high direct bilirubin raises concern about cholestasis, meaning bile isn’t draining well, and clinicians look for causes such as biliary atresia.
Home Care
Jaundice is easiest to see in white light such as daylight, and babies are generally checked by a doctor or nurse at 3 to 5 days of age. At home, watch whether the yellow color spreads to the belly, arms, or legs, and whether the whites of the eyes look yellow. Keeping a daily note of feeds, wet diapers, and stool and urine color can be useful at appointments. Stool color matters in particular: cholestasis may come with dark urine, pale or gray stools, and an enlarged liver.
Common Parent Misconceptions
Some parents think they must stop breastfeeding because jaundice is lasting, but longer jaundice is common in breastfed babies. That said, it shouldn’t be brushed off by default; gray or pale stool and dark urine are key differences that separate a harmless pattern from one needing testing. Another point is timing: biliary atresia is treated with surgery, and outcomes are generally better when surgery happens before about 2 months of age, which is why testing shouldn’t be put off when jaundice runs past the usual window.
Signs That Need Medical Care
Consider talking with a pediatrician if formula-fed babies are still yellow at 2 weeks, or breastfed babies at 3 to 4 weeks. Also call if the yellow color spreads to the belly, arms, or legs, the whites of the eyes deepen in color, stools look gray or white, or urine looks dark. If your baby is hard to wake, unusually fussy, or not feeding well, seek emergency care right away. This information reflects U.S. guidance; if you live in another country, please check with a local pediatrician. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.