| Age | PR interval (ms) | QRS duration (ms) | R wave (S wave) amplitude (mm) | |
|---|---|---|---|---|
| Lead V1 | Lead V6 | |||
| Birth | 80-160 | <75 | 5-26 (1-23) | 0-12 (0-10) |
| 6 months | 70-150 | <75 | 3-20 (1-17) | 6-22 (0-10) |
| 1 year | 70-150 | <75 | 2-20 (1-20) | 6-23 (0-7) |
| 5 years | 80-160 | <80 | 1-16 (2-22) | 8-25 (0-5) |
| 10 years | 90-170 | <85 | 1-12 (3-25) | 9-26 (0-4) |
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