What is a common initial sign of a respiratory infection in children?

Nasal congestion is a common initial sign of a respiratory infection in children. It often occurs as the first symptom due to the inflammation and swelling of the nasal passages as the body responds to the infectious agents, such as viruses or bacteria. When a child contracts a respiratory infection, whether it's a common cold or another type of respiratory illness, the body triggers an immune response, leading to increased mucus production and congested nasal passages. This can cause difficulty breathing through the nose, which is something parents and caregivers often notice first.

Other symptoms like loss of appetite, elevated heart rate, or high fever may develop later as the illness progresses, but nasal congestion typically appears early in the course of respiratory infections in children. Understanding these initial signs assists caregivers and healthcare providers in recognizing respiratory infections promptly, allowing for appropriate monitoring and intervention.