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How much jaundice is ok in my newborn?

Mild jaundice in the first week is very common and usually harmless, but jaundice that appears in the first 24 hours, spreads past the chest, or comes with poor feeding or extreme sleepiness needs same-day medical assessment.

Doctors use your baby's exact age in hours plus a bilirubin test (skin or blood) to decide if the level is safe or needs treatment, rather than relying on how yellow the skin looks alone.

Strength of evidence

Strong

Based on national pediatric guidelines from the Canadian Paediatric Society, American Academy of Pediatrics, and CDC, all reflecting consistent expert consensus rather than a single study.

What the evidence says

Some jaundice is completely normal. About 6 in 10 newborns turn a bit yellow between days 2 and 4 as their liver catches up on clearing bilirubin, and it usually fades on its own within 1-2 weeks. Jaundice that stays only on the face is generally harmless.

What matters is the pattern and the number, not just 'some yellow.' Doctors track bilirubin using a graph based on your baby's exact age in hours, since a level that's fine at 3 days old could be concerning at 1 day old. That's why hospitals check bilirubin (often with a quick skin sensor, sometimes a blood test) before discharge and again at a follow-up visit within a day or two if your baby went home early.

Call your doctor the same day if the yellow spreads to the belly, arms, or legs, if the whites of the eyes look very yellow, if your baby is hard to wake, feeding poorly, unusually fussy, or not making enough wet or dirty diapers. Jaundice showing up in the first 24 hours of life should always be checked right away rather than watched.

Severe, untreated jaundice is rare but can affect the brain (kernicterus), so treatment with phototherapy (special lights) is used well before levels get that high. Frequent feeding helps keep bilirubin down, and if breastfeeding isn't going smoothly, getting help early can prevent jaundice from worsening.

Sources

✓Reviewed by CH, MD, FRCPC

Reviewed by a specialist physician certified by the Royal College of Physicians and Surgeons of Canada, who has read this answer against the sources listed above and confirmed it reflects them. That is not medical advice about your child. How we review

Answer checked July 27, 2026

Educational information only. Not medical advice, not a diagnosis, and no doctor-patient relationship is created by using this. Founded Parent has not examined your child and does not know their history, so this may not apply to you. In an emergency, call your local emergency number. What Founded Parent cannot do

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