Table 1.

Recommended tracheal tube size and depth of tracheal tube insertion for oral and nasal intubation in relation to the body weight of a neonate and an infant

Body weight (g)	Internal diameter (mm)	Depth of tracheal tube insertion (oral intubation) (cm)	Depth of tracheal tube insertion (nasal intubation) (cm)
< 750	2.5	5.5–6	6.5–7
750–1000	3	6–7	7–8
1001–2000	3	7–8	9
2001–3000	3.5	8–9	10
3000–3500	3.5	9–10	11
> 3500	4.0	b.w. (kg) + 6	b.w. (kg) + 7

bw body weight