Age Weight (Kg) Blade ETT
NB   0-1 3
Infant 5 1 3.5
Toddler 10 1-2 or 1.5 Wis-Hipple 4.5
6 years 20 2 5
9 years 30 2 6
Adolescent 50 3 7
Adult >50 3 8

Depth of ETT

  • Newborn: 6 + weight (kg)
  • Others: 3 X size of ETT

Size of ET tube

  • Uncuffed tube: (Age/4) + 4
  • Cuffed tube: (Age/4) + 3

Microcuff pediatric ETT (Green adapter) recommend size selection

Tube Size ID Age (Yrs)
3.5 8 mo to < 2yrs
4 2 to < 4 yrs
4.5 4 to < 6yrs
5 6 to < 8yrs
5.5 8 to <10 yrs
6 10 to < 12 yrs
6.5 12 to < 14 yrs
7 14 to < 16 yrs

Please see PICU Common Medications page for general guidelines for drug choices for rapid sequence intubation.