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Endotracheal Intubation in Neonates

Weight at Time of Intubation (kg)

Weeks of Gestational Age

Insertion Depth at Lips (cm)

Endotracheal Tube Size (diameter, mm)

0.5–0.6

23–24

5.5

Size 2.5: For infants < 1 kg or < 28 weeks of gestational age

0.7–0.8

25–26

6.0

0.9–1.0

27–29

6.5

Size 3.0: For infants 1 to 2 kg or 28 to 34 weeks of gestational age

1.1–1.4

30–32

7.0

1.5–1.8

33–34

7.5

Size 3.5: For infants > 2 kg or > 34 weeks of gestational age

1.9–2.4

35–37

8.0

2.5–3.1

38–40

8.5

3.2–4.2

41–43

9.0

Size 3.5 to 4.0

Data from Kempley ST, Moreiras JW, Petrone FL: Endotracheal tube length for neonatal intubation. Resuscitation 77(3):369-373, 2008. doi: 10.1016/j.resuscitation.2008.02.002 and from Weiner GM, ed: Textbook of Neonatal Resuscitation, ed. 8. Itasca, American Academy of Pediatrics, 2021.

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