Acute Mountain Sickness (AMS) is a condition that can occur when a child ascends to high altitudes too rapidly. Symptoms include headaches, dizziness, nausea, vomiting, and fatigue. In severe cases, AMS can progress to more serious conditions like High-Altitude Cerebral Edema (HACE) and High-Altitude Pulmonary Edema (HAPE). Early recognition and treatment are crucial to prevent complications.