Version May 2024
| Gestation (weeks) | Endotracheal tube insertion depth at lips (cm) | Baby's weight (g) |
| 23 to 24 | 5.5 | 500 to 600 |
| 25 to 26 | 6.0 | 700 to 800 |
| 27 to 29 | 6.5 | 900 to 1000 |
| 30 to 32 | 7.0 | 1100 to 1400 |
| 33 to 34 | 7.5 | 1500 to 1800 |
| 35 to 37 | 8.0 | 1900 to 2400 |
| 38 to 40 | 8.5 | 2500 to 3100 |
| 41 to 43 | 9.0 | 3200 to 4200 |
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