Sunlight contains the blue wavelengths that are effective for bilirubin conversion, and this is the biological truth behind the traditional practice of placing a jaundiced newborn near a window. However, I want to be direct about the limitations of this approach and the risks it carries when used as a substitute for proper monitoring and medical phototherapy. The amount of blue-spectrum light that a baby receives through a window, or even in filtered outdoor sunlight, is a fraction of the light intensity delivered by a clinical phototherapy unit. At Shri Shishu Bhawan, Bilaspur, our phototherapy equipment delivers a precise, measurable irradiance of blue light to the maximum surface area of the baby's skin. The sun delivers a variable, uncontrolled light source through the atmosphere, through window glass, through clouds, and at an intensity that changes throughout the day and between days. For a baby with mildly elevated bilirubin who is otherwise well and feeding adequately, brief periods near a sunny window are not harmful. But I do not recommend sunlight as a treatment for jaundice for several reasons. The first is that parents cannot assess whether the bilirubin is responding by looking at the skin colour: yellow colour in the skin is not a reliable real-time guide to the bilirubin level, because colour changes lag behind blood level changes. Only bilirubin measurement, by transcutaneous device or blood test, tells you whether the level is rising, falling, or stable. The second is that exposing a newborn to direct sunlight outdoors carries a risk of sunburn and overheating that is not acceptable in a baby in the first two weeks of life. The third is that if the bilirubin level is high enough to consider treatment, it should be measured and treated with precision rather than managed with an uncertain and unmeasurable intervention. If your baby has visible jaundice, the correct response is to have the bilirubin measured by a clinician: I can do this with a transcutaneous measurement at Shri Shishu Bhawan, Bilaspur without a blood test, and this tells us in two minutes whether we are in the safe range or approaching the treatment threshold.
Written by Dr. Shrikant Giri, MBBS, MD (Paediatrics), Fellowship Critical Care (IAP), DPAA, FAAP, Registered NRP Instructor, State Basic NRP Coordinator, Regional Advanced NRP Instructor, Director, Shri Shishu Bhawan, Bilaspur, Chhattisgarh. Phone: +91 93009 89803.
