When assessing a 4-month-old infant with heart failure, which finding should be prioritized by the nurse?

Prioritizing episodes of vomiting in a 4-month-old infant with heart failure is crucial because vomiting can indicate a significant problem, such as worsening heart failure or gastrointestinal complications related to fluid overload or medication side effects. In infants, vomiting can lead to dehydration and electrolyte imbalances, which may further exacerbate heart failure symptoms.

Given that heart failure in infants can manifest through various signs, assessing gastrointestinal symptoms like vomiting can provide critical insight into the infant's overall stability and require immediate intervention. While a decreased activity level, increased feeding frequency, and pale skin color are important findings, vomiting should take precedence because it can rapidly affect the infant's condition and requires prompt evaluation and response to mitigate potential complications.