# Newborn Jaundice: What Dads Need to Know in the First Two Weeks > Newborn jaundice explained for dads: why babies turn yellow, when it peaks and clears, how it's tested, why you can't judge it by eye, feeding, phototherapy, why sunlight isn't a treatment, and when to call. By Yoedhistiera, Bapak Life. Topic: Newborn. Published November 8, 2026. Canonical: https://bapaklife.com/newborn-jaundice/ ## Key takeaways - Most babies get some jaundice, and most of the time it's harmless. - It's usually highest around days 3 to 5, often after you're home, so the follow-up visit matters. - A bilirubin test beats your eyes, especially on darker skin. Jaundice in the first 24 hours gets measured right away. - Feed often. The AAP says sunlight is not a safe way to treat jaundice, and water is out too. - Trouble waking, a high-pitched cry, arching, or a stiff or floppy body means 911 or the ER. It's day 3, and your baby looks a little yellow. Most of the time this is normal: "Most babies develop jaundice in the first few days after birth because it takes a few days for the baby's liver to get better at removing bilirubin," the AAP says. Two things are worth knowing right away. A real bilirubin number beats your eyes, and the follow-up visit matters more than most people realize. **A note before you start:** this is general guidance, not medical advice. If you're worried about how your baby looks or acts, call your pediatrician. ## The short answer - **Common and usually harmless.** The CDC has said about 60% of babies get it. - **Usually highest around days 3 to 5,** often after you've gone home. - **Yellow in the first 24 hours** means get the level measured right away. - **A test beats your eyes,** especially on darker skin. - **Keep feeding.** No sunlight treatment, and no water. - **Emergency signs:** hard to wake, high-pitched crying, arching, or a stiff or floppy body. ## What jaundice is and why so many babies get it Jaundice is the yellow color from bilirubin, a substance the liver clears out of the blood. A newborn's liver takes a few days to get up to speed. The AAP says "most babies" get it, the CDC has said about 60%, and other sources range from half to 4 in 5. ## When it shows up, peaks and clears | Stage | When | |---|---| | **Shows up** | Most often day 2 to 4 | | **Highest** | Usually around days 3 to 5 | | **Formula-fed** | Most is gone by 2 weeks | | **Breastfed** | Common to last 1 month, occasionally longer | It usually starts on the face and moves down the chest, belly, arms and legs as the level rises. On the way out, it reverses. **Dad's job:** put the first follow-up visit in your phone before you leave the hospital. ## The first 24 hours is different "Any baby that has jaundice in the first 24 hours after birth should have the bilirubin level measured right away," the AAP says. Jaundice this early is often a sign that red blood cells are breaking down too fast, so it isn't the usual kind. **Dad's job:** if you see yellow on day 1, tell the nurse now. ## How doctors check it "All babies should have at least one bilirubin measurement with skin or blood test before discharge from the hospital," the AAP says. A nurse may use a light meter on your baby's head, and if that's high, a small blood sample from the heel, which the CDC has called the best way to measure accurately. The treatment line depends on your baby's age in hours and other risk factors, and the AAP raised those thresholds slightly in 2022. So old charts online are out of date, and we're not printing any numbers here. **Dad's job:** ask three things before discharge. What was the number? Is that high for their age in hours? When is the recheck? ## Why you can't judge it by eye You can look, but don't trust it. A 2023 American Academy of Family Physicians review says "Do not use visual assessment alone to diagnose hyperbilirubinemia." Nationwide Children's says "Skin color alone is not a good way to tell if jaundice is getting worse." **Darker skin makes it harder.** "Jaundice may be harder to see in babies with darker skin color," the AAP says. An archived CDC page says checking the gums and inner lips may detect it, and "If there is any doubt, a bilirubin test should be done." Doctors also check under the tongue and the whites of the eyes. The AAP's guideline used to list Black race as protective. It removed that, and recent data show Black infants have a higher risk of hazardous levels. So never let anyone wave off a test because of skin tone. The AAP says jaundice is best seen in white light, such as daylight. That's for looking at your baby, not a treatment. ## The follow-up visit "It is important for your baby to get checked soon after leaving the hospital," the AAP says. In most cases, babies discharged before 48 hours should be seen within 2 days. Under the 2022 guideline, the timing depends on how close your baby's number is to the treatment line, so it could be sooner. The AAP says a baby may need an earlier visit with: - A high bilirubin level before leaving the hospital. - Birth more than 2 weeks before the due date. - Jaundice in the first 24 hours. - Breastfeeding that isn't going well yet. - Bleeding under the scalp or a lot of bruising from delivery. **Dad's job:** book it, drive to it, and bring the discharge papers and your feeding and diaper log. See [how to change a diaper](/how-to-change-a-diaper/) for the diaper counts. ## Feeding is the part you can control Babies get rid of bilirubin in their poop, so more milk in means more bilirubin out. "If you are breastfeeding, you should breastfeed your baby at least 8 to 12 times a day for the first few days," the AAP says. The Schmitt pediatric triage guidelines on the AAP's site, which aren't AAP policy, say for a jaundiced baby not to go more than 4 hours at night without a feed. **Dad's job:** run the log, and take the burp and diaper shifts so your partner can feed more. Wake your baby for feeds if the doctor says to. See [night feeds for dads](/night-feeds-for-dads/). ## Breastfeeding and jaundice Jaundice is more common in breastfed babies, the AAP says, mostly when they aren't getting enough milk yet. Doctors separate two patterns: - **Breastfeeding jaundice** comes from not getting enough calories, often with extra weight loss. This is the fixable one. - **Breast milk jaundice** happens in babies feeding and gaining well. It's harmless and usually clears by about 3 months, and the baby can keep breastfeeding. Your partner generally doesn't need to stop breastfeeding. "In some babies, supplementing breast milk with formula can help lower the bilirubin level," the AAP says, so that's a decision to make together with the doctor. The AAFP review notes that mothers of babies with jaundice are more than twice as likely to stop breastfeeding by 1 month, and that encouragement from health care professionals is one of the strongest predictors of continuing. **Dad's job:** get a lactation visit booked, and shut down any talk that this is your partner's fault. ## Phototherapy, in the hospital and at home "Most jaundice requires no treatment," the AAP says. When it's needed, babies go undressed under special lights. - **It doesn't hurt.** "The lights will not hurt the baby," the CDC has said. Soft patches protect the eyes. - **Feeding breaks** of up to 30 minutes are fine, the AAFP says. - **The downsides** are short-term: temperature swings, diarrhea, and being separated from you. - **At home:** the AAP says it can sometimes be done at home, depending on the level, age and other factors. It takes a doctor's order and a device, and bilirubin blood checks every day. - **After the lights,** the level gets rechecked the next day. "Very high bilirubin levels are a medical emergency that might require admission to the intensive care unit," the AAP says, and may need a special blood transfusion. ## Sunlight isn't a treatment, and neither is water You'll hear this from relatives. Don't do it. - **Sunlight:** "Putting your baby into sunlight is not a safe way to treat jaundice," the AAP says. The AAFP says guidelines do not recommend direct or indirect sunlight, so that includes a sunny window. It can also cause sunburn. - **Water:** the AAP guideline says water or sugar water isn't recommended. Water isn't safe at this age anyway. See [how much formula by age](/how-much-formula-by-age/). ## Who's at higher risk - **Babies born early.** - **Blood type differences** with the birth parent, such as an O blood type or Rh negative. - **G6PD deficiency,** an inherited enzyme problem behind an estimated 1 in 5 US kernicterus cases. Tell the doctor about family history or ancestry from places where it's common, like Sub-Saharan Africa, the Middle East, the Mediterranean, the Arabian Peninsula and Southeast Asia. Many affected babies have no family history, the AAFP says. The AAP's 2022 guideline removed race as a risk factor. Some older pages still list it. The AAP also says to tell your doctor about exposure to fava beans, mothballs, henna or herbal remedies. It lists antibiotics too, but that's so the doctor can review them, not a reason to stop them on your own. ## Kernicterus: rare, permanent, and why the checks exist Kernicterus is permanent brain damage from very high bilirubin. It's rare, about 1 in 100,000 babies in high-income countries by one estimate, though the AAP says there's no current US registry. It can cause cerebral palsy and hearing loss. "Early detection and management of jaundice can prevent kernicterus," the CDC has said. That's why the test and the follow-up exist. ## Still yellow after a couple of weeks? Check the diapers The AAP says to tell your doctor if jaundice lasts more than 2 weeks on formula or more than 4 weeks if primarily breastfed. **Pale poop changes the timeline.** White, gray or pale poop, or dark pee, can be a sign of biliary atresia, a rare liver disease that does best when treated before 1 month. Call the same day, whatever the age, and take a photo. Our [baby poop color chart](/baby-poop-color-chart/) has the details. ## When to call **Call today if:** - Your baby's skin turns more yellow. - The belly, arms or legs are yellow, or the whites of the eyes are. - Your baby is hard to wake, fussy, or not feeding well. - Your baby is very yellow or orange. - Your baby is 4 or more days old and hasn't been checked since going home (Schmitt guidelines). **Call 911 or go to the ER if your baby:** - Is crying inconsolably or with a high pitch. - Is arched like a bow, with the head or neck and heels bent backward. - Has a stiff, limp or floppy body, or strange eye movements. - Can't wake up. For a fever, follow our [baby fever guide](/baby-fever-when-to-call-the-doctor/), and don't give fever medicine first. ## FAQ ### How long does newborn jaundice last? Formula-fed babies usually clear it by 2 weeks. In breastfed babies, it's common for it to last 1 month, occasionally longer. Tell the doctor past 2 weeks on formula or past 4 weeks if primarily breastfed. ### Can I put my baby in sunlight or by a sunny window for jaundice? No. The AAP says sunlight is "not a safe way to treat jaundice," and guidelines don't recommend direct or indirect sunlight. ### Should I give my baby water for jaundice? No. Water isn't recommended for jaundice and isn't safe for young babies. ### Should we stop breastfeeding? Generally no. Feed more, get help with feeding, and follow the doctor on whether to add formula or pumped milk. ### How can I tell if a baby with darker skin has jaundice? It's harder to see. An archived CDC page suggests checking the gums and inner lips. If there's any doubt, ask for a bilirubin test. ### When is jaundice an emergency? High-pitched crying that won't stop, arching, a stiff or floppy body, strange eye movements, or a baby who can't wake up. Call 911 or go to the ER. ### Is jaundice dangerous? Most is harmless. Very high levels can cause kernicterus, which is rare and permanent, and early detection can prevent it. ## Sources - American Academy of Pediatrics: [Jaundice in newborns](https://www.healthychildren.org/English/ages-stages/baby/Pages/Jaundice.aspx), [2022 guideline news](https://www.healthychildren.org/English/news/Pages/AAP-Revises-Clinical-Guidelines-for-Hyperbilirubinemia-in-Newborns.aspx), [Guideline citation (Kemper et al. 2022)](https://pubmed.ncbi.nlm.nih.gov/35927462/), [Guideline FAQ for clinicians](https://www.aap.org/en/patient-care/hyperbilirubinemia/frequently-asked-questions-about-the-2022-aap-guideline-on-the-management-of-hyperbilirubinemia/), [Biliary atresia](https://www.healthychildren.org/English/health-issues/conditions/abdominal/Pages/biliary-atresia.aspx) and [2025 biliary atresia guidance](https://www.healthychildren.org/English/news/Pages/identifying-babies-with-biliary-atresia-new-aap-guidance.aspx) - American Academy of Family Physicians: [Neonatal hyperbilirubinemia, May 2023](https://www.aafp.org/pubs/afp/issues/2023/0500/neonatal-hyperbilirubinemia.html) and [Summary of the AAP guideline, June 2023](https://www.aafp.org/pubs/afp/issues/2023/0600/practice-guidelines-hyperbilirubinemia-newborns.html) - CDC (archived pages, last reviewed December 2020): [Facts about jaundice and kernicterus](https://archive.cdc.gov/www_cdc_gov/ncbddd/jaundice/facts.html) and [For families](https://archive.cdc.gov/www_cdc_gov/ncbddd/jaundice/families.html) - Hospitals: [Nationwide Children's](https://www.nationwidechildrens.org/conditions/jaundice-in-children), [Cincinnati Children's](https://blog.cincinnatichildrens.org/healthy-living/infant-jaundice-5-things-expecting-parents-should-know/); Schmitt Pediatric Guidelines (not AAP policy): [Jaundiced newborn](https://www.seattlechildrens.org/conditions/a-z/jaundiced-newborn/)