Cord blood test reveals hidden tobacco harm to newborns

This study looks at how tobacco smoke exposure during pregnancy—whether from smoking or secondhand smoke—affects a newborn's health right after birth. Researchers will measure a chemical called cotinine in the baby's cord blood to sort babies into three groups: active exposure, passive exposure, or no exposure. They will then compare health markers like blood gases, oxygen levels, and birth weight. No treatments or extra procedures are given; the study only observes routine care. About 126 mother-baby pairs will take part.