Why cyanosis is called as blue babies?

Cyanosis is referred to as "blue babies" because it is a condition characterized by a bluish discoloration of the skin and mucous membranes in infants, particularly noticeable on the lips and extremities. This occurs due to low oxygen levels in the blood, often resulting from congenital heart defects or respiratory issues that impair proper oxygenation. The term highlights the visible symptom of cyanosis, which can be alarming for parents and caregivers.