This is Part 1 of a two-part series about the approach to pediatric ECGs. This series was developed by Eric King, a medical student at the University of Alberta. This podcast was developed with the help of pediatric hospitalist and medical educator Dr. Karen Forbes, pediatric cardiologist Dr. Joseph Atallah and the help of the PedsCases team. This series will cover how to systematically interpret a pediatric ECG, how the forces within the heart change and progress after birth, how to recognize a normal pediatric ECG at different points in childhood, and how to recognize common pediatric ECG abnormalities. Part 1 will discuss rate, rhythm, axis, and intervals, and will work through a case of a 4-week-old boy with a new murmur.