What is one of the three cardinal signs that indicate a child is choking?

Turning blue, also known as cyanosis, is one of the most critical signs that a child may be choking. When a child is choking, their airway is obstructed, preventing air from reaching the lungs. This lack of airflow leads to decreased oxygen levels in the blood, resulting in the bluish discoloration of the skin, particularly noticeable around the lips and face. This is a medical emergency requiring immediate attention.

The other signs, such as gagging, vomiting, or gasping, may accompany choking but do not indicate the severity of the situation as clearly as turning blue does. Gagging can occur as a reflex action to clear an obstruction, vomiting can happen in various conditions unrelated to choking, and gasping may indicate difficulty breathing but does not provide the same immediate visual cue for urgency as cyanosis. Recognizing the sign of turning blue is vital for prompt intervention to restore the child's airway and prevent further complications.