Q: What size ET tube for a neonate?

<28 weeks GA: 2.5 mm. 28–33 weeks: 3.0 mm. 34–37 weeks: 3.5 mm. ≥38 weeks: 3.5–4.0 mm. Pick the larger size if the infant is at the upper end of the range or if longer-term ventilation is expected.

Q: How do you confirm ET tube placement?

Bilateral equal breath sounds, symmetric chest rise, sustained color change on a CO2 detector, improvement in heart rate and saturations, and a chest X-ray showing the tip 1–2 cm above the carina (around T1–T2).

Question 1

What is the NRP rule for ETT depth in neonates?

Accepted Answer

Insertion depth at the upper gum (cm) = 6 + weight in kg (NRP 8th ed.). A 1 kg infant intubates to ~7 cm at the gum; a 3 kg infant to ~9 cm. This is a starting estimate — always confirm with auscultation, CO2 detection, and chest X-ray.

Question 2

What size ET tube for a neonate?

Accepted Answer

<28 weeks GA: 2.5 mm. 28–33 weeks: 3.0 mm. 34–37 weeks: 3.5 mm. ≥38 weeks: 3.5–4.0 mm. Pick the larger size if the infant is at the upper end of the range or if longer-term ventilation is expected.

Question 3

How do you confirm ET tube placement?

Accepted Answer

Bilateral equal breath sounds, symmetric chest rise, sustained color change on a CO2 detector, improvement in heart rate and saturations, and a chest X-ray showing the tip 1–2 cm above the carina (around T1–T2).

ETT Depth Calculator

Calculate ETT Depth (NRP rule)

NRP depth rule (8th edition)

Worked example

ETT size by gestational age

More NICU calculators

Important Notice