**Core Concept**
Congestive heart failure (CHF) in infants presents with systemic symptoms due to impaired cardiac output and fluid overload, rather than peripheral edema. The clinical picture is dominated by respiratory and metabolic signs, reflecting the body's response to reduced perfusion and pulmonary congestion.

**Why the Correct Answer is Right**
Pedal edema is not a typical sign of congestive heart failure in infants. Unlike older children or adults, infants have limited subcutaneous fat and poor venous return to extremities, making peripheral edema rare. Instead, CHF in infants manifests with tachypnea (due to pulmonary congestion), sweating (from increased metabolic demand), and poor weight gain (due to reduced feeding tolerance and malabsorption). The absence of pedal edema is a key distinguishing feature.

**Why Each Wrong Option is Incorrect**
Option B: Tachypnea is a hallmark of infant CHF due to pulmonary congestion and increased work of breathing.
Option C: Sweating occurs as a result of increased metabolic demand and hypoxia in failing hearts.
Option D: Poor weight gain is a classic sign due to reduced oral intake and poor nutrient absorption.

**Clinical Pearl / High-Yield Fact**
In infants, CHF presents with respiratory distress, feeding difficulties, and poor growth—**pedal edema is absent** because of anatomical and physiological differences in infant circulation and body composition.

✓ Correct Answer: A. Pedal edema