In plain words
Hyperbilirubinemia means is higher than normal in the blood. Bilirubin is a yellow pigment made when old red blood cells break down. The liver usually clears it, but a newborn's liver is still developing. So most newborns have some bilirubin, and many turn yellow in the first week. That yellow color is called . Clinicians measure bilirubin with a skin reading or a blood test. They compare the number with the baby's age in hours and with other risk factors. Most cases are mild and clear over time, often with frequent feeding. A small number need light therapy, and a very few need more intensive care. Tell your provider the same day if the yellow spreads down the body or the baby is hard to wake or feeding poorly.
The deeper version
Unconjugated bilirubin results from heme catabolism. In neonates, higher red cell turnover, immature hepatic UDP-glucuronosyltransferase activity, and raise levels. The AAP 2022 guideline (Kemper and colleagues, Pediatrics, 2022) uses a bilirubin nomogram by postnatal age in hours, with risk-factor-adjusted thresholds for and exchange transfusion. It recommends transcutaneous measurement, with serum bilirubin when levels are high. , the neurotoxic outcome of unconjugated bilirubin, is rare at current thresholds. Controversy concerns the in late preterm and healthy term infants, and whether breastfeeding-associated jaundice needs more intensive feeding support or can be managed by observation.
Where it comes up
- Newborn jaundiceBaby Basics
- Newborn weight: the early drop and regainingBaby Basics
- Colostrum and the first days before milk comes inFeeding Your Baby
- The first 24 hoursBirth and the First Days
What mothers here say about hyperbilirubinemia
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Sources
- Kemper AR, Newman TB, Slaughter JL et al. — Clinical Practice Guideline Revision: Management of Hyperbilirubinemia in the Newborn Infant 35 or More Weeks of Gestation. Pediatrics, 2022