Returning home from the maternity ward, parents may be surprised to notice that their newborn's skin has taken on a yellowish or golden hue. This condition, known as newborn jaundice, is extremely common—it occurs in 60-80% of full‑term infants. For most of them it is an entirely normal, temporary condition related to the body's adaptation to life outside the womb. However, there are also pathological forms of jaundice that require immediate medical intervention. Understanding the difference between physiological norm and warning signs is key to maintaining calm and your child's health.
Why does jaundice occur? A simple explanation of bilirubin
The cause of the skin's yellowing is an increased level of the yellow pigment — **bilirubin** — in the blood. Bilirubin is produced as a result of the natural breakdown of red blood cells (erythrocytes).
In a newborn there are several reasons for its accumulation:
- More red blood cells: In the womb the fetus has significantly more red blood cells than an adult, because they have a different type of hemoglobin adapted for obtaining oxygen via the placenta. After birth these “extra” red blood cells begin to break down actively.
- Immature liver: The liver is responsible for processing bilirubin, making it water‑soluble so it can be eliminated from the body via stool and urine. In a newborn the liver is not yet operating at full capacity and simply cannot keep up with the large amount of bilirubin.
As a result, the “extra” bilirubin accumulates in the blood and deposits in the skin and mucous membranes, giving them a yellow tint.
Physiological jaundice: when is it normal?
This is the most common type of jaundice, which is part of the child's normal adaptation.
Key signs of physiological jaundice:
- Time of onset: Appears no earlier than 24 hours after birth, usually on day 2–3.
- Course: Bilirubin level gradually rises, reaching a peak on day 3–5, after which it begins to decline on its own.
- Duration: Usually resolves completely by day 10–14 of life.
- Overall condition of the baby: The infant is active, feeds well, has normal urine color (clear or light‑yellow) and stool (mustard‑colored).
There is also **breast‑feeding jaundice**, which can last longer (sometimes up to 2–3 months) and is related to certain substances in the mother’s milk. It is also safe as long as the baby is gaining weight well.
Pathological jaundice: “red flags” that must not be ignored
This type of jaundice is a sign of disease and requires immediate diagnosis and treatment.
Main signs of pathological jaundice:
- Very early onset: Appeared **within the first 24 hours** of life.
- Very high levels: Bilirubin level rises rapidly to very high numbers.
- Prolonged course: Does not resolve beyond 2–3 weeks in full‑term children.
- Associated symptoms: The infant becomes **lethargic, sleepy, feeds poorly**. Important signs are **pale, white stool** and **dark, concentrated urine**.
- Wave‑like course: Jaundice disappears and then reappears.
Causes of pathological jaundice can include Rh incompatibility, ABO blood‑type conflict, infections, genetic diseases, or liver problems. For other warning signs, read the article "When to Call the Doctor?".
Why is high bilirubin dangerous?
Extremely high levels of indirect bilirubin are toxic to the infant’s brain and can lead to a severe complication—kernicterus (bilirubin encephalopathy), which causes irreversible neurological damage. It is important to emphasize that with modern medical monitoring this condition is **extremely rare**.
Diagnosis and treatment
- Diagnosis: Bilirubin level can be measured through the skin with a special device (bilirubinometer) or by blood test, which is the "gold standard".
- The best treatment for physiological jaundice is frequent feeding. Bilirubin is eliminated primarily through stool. The more often the baby feeds, the more active the intestines are. Breastfeeding on demand is the best prevention and treatment. It is not advisable to give the baby water or glucose solution — this does not speed up bilirubin elimination and only reduces the amount of milk consumed.
- Phototherapy ("blue lamp"): This is the primary method for treating pathological jaundice. The baby is placed under a special blue‑spectrum lamp. Under the light, toxic bilirubin in the skin is converted into a non‑toxic, water‑soluble form and is easily eliminated from the body.
Remember, jaundice is a condition that requires close monitoring. Your task is to ensure effective feeding and carefully watch the baby’s overall condition. Do not attempt self‑treatment (for example, exposing the baby to sunlight through a window, which is ineffective) and consult your pediatrician immediately if you have any doubts.
