Normal Pediatric ECG values

AgeHR (bpm)QRS axis (degrees)PR interval (sec)QRS interval (sec)R in V1 (mm)S in V1 (mm)R in V6 (mm)S in V6 (mm)
1st wk90-16060-1800.08-0.150.03-0.085-260-230-120-10
1-3 wk100-18045-1600.08-0.150.03-0.083-210-162-160-10
1-2 mo120-18030-1350.08-0.150.03-0.083-180-155-210-10
3-5 mo105-1850-1350.08-0.150.03-0.083-200-156-220-10
6-11 mo110-1700-1350.07-0.160.03-0.082-200.5-206-230-7
1-2 yr90-1650-1100.08-0.160.03-0.082-180.5-216-230-7
3-4 yr70-1400-1100.09-0.170.04-0.081-180.5-214-240-5
5-7 yr65-1400-1100.09-0.170.04-0.080.5-140.5-244-260-4
8-11 yr60-130-15-1100.09-0.170.04-0.090-140.5-254-250-4
12-15 yr65-130-15-1100.09-0.180.04-0.090-140.5-214-250-4
>16 yr50-120-15-1100.12-0.200.05-0.100-140.5-234-210-4

References

Abdulla R, Bonney W, Khalid O, Awad S. Pediatric Electrocardiography Cham. Springer International Publishing; 2016. [book]


Other quick reference resources.

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