Breathe in. In that one simple motion, your diaphragm tightened up and moved down. This made your chest cavity bigger. Your intercostal muscles between your ribs tightened up, too. This made your ...

Something else to pay attention to is how the child is breathing, which could indicate the infection has moved.

Tachypnea, irregular breathing, grunting, nasal flaring, and/or retractions indicate that breathing is not easy and that there is abnormally increased work of breathing. If the answer to the ...