Axis: Rightward axis
- Large R wave in V1-V2, small S in V5-V6
- Narrow, sharp in inferior and lateral leads
- PR short without aberrant conduction
- QRS <80ms prior to age 8
- QT 490ms may be normal up to 6 mo old
- Inverted V1-V3
- usually through age 8, but may persist as 'Juvenile T wave abnormality'