Following surgery for Tetralogy of Fallot (blue baby syndrome), it is crucial for children to undergo annual follow-ups with a pediatric cardiologist. These routine check-ups are essential for monitoring and managing potential post-operative complications, such as cardiac arrhythmias. A common long-term issue is pulmonary valve regurgitation, where leakage in the pulmonary artery valve can lead to excess blood flow to the right side of the heart. Over time, this can result in right heart failure and the onset of new arrhythmias. In some cases, intervention may be required around 10-12 years of age to address these complications.