A 2-year-old toddler with a history of ventricular septal defect (VSD) repair is brought to the pediatric clinic for a routine follow-up.

Key Postoperative Concern: Following VSD repair, residual shunts or ventricular dysfunction can precipitate heart failure. The most sensitive clinical indicator in toddlers is the inability to tolerate feeding.

• Feeding Evaluation: Observe for diaphoresis, tachypnea, or fatigue during feeds. Calculate caloric intake; poor volume often precedes weight loss.
• Vital Sign Interpretation: Recognize age-specific norms. Isolated borderline tachycardia (e.g., 140 bpm) or tachypnea (e.g., 35/min) requires contextual assessment for work of breathing and perfusion.
• Murmur Differentiation: A residual murmur is common and often benign. Distinguish a new or worsening murmur from a stable postoperative finding.

• Diaphoresis with minimal exertion or at rest.
• Failure to gain weight or crossing growth percentiles.
• Hepatomegaly or periorbital edema indicating right-sided failure.

Clinical Pearl: The triad of poor feeding, diaphoresis, and failure to thrive is pathognomonic for pediatric heart failure and warrants immediate echocardiography and cardiology referral.