The Parents Bring Their 3-Year-Old Son to the Emergency Department

The parents bring their 3-year-old son to the emergency department after having found that he has ingested some of his mother's medicine. Which assessment would be of critical importance for this child?

A) Assessing mental status and skin moisture and color
B) Evaluating the effectiveness of the child's breathing
C) Noting the child's pulse rate and quality
D) Auscultating all lung fields for signs of edema