Name 5 ways a normal infant's EKG differs from that of a normal adult.

Here's a clue. A normal infant's EKG ...

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1. rightward axis
2. tall R in V1-2
   
3. shorter QRS interval
4. shorter PR interval
   
5. relatively faster HR
   
6. inverted T waves in leads V1-3

These differences arise because of an infant's proportionately larger right ventricle yet still smaller total cardiac muscle mass relative to an adult's heart.

Some numbers ...

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Source

Sharieff, G MD and Rao, S. "The Pediatric ECG." Emerg Med Clin N Am, 2006.