Pediatric Guedel Airway Size by Weight

Oropharyngeal Airway (OPA) · Equipment

Guedel Pattern Airway

Notes

Control: length from edge of mouth to ear lobe

Oropharyngeal Airway (OPA): value for each weight
Weight	Age (estimate)	Value
2 kg	preterm	Size 000 (3.5 centimeters)
3 kg	newborn	Size 000 (3.5 centimeters)
4 kg	1 mo	Size 000 (3.5 centimeters)
5 kg	2 mo	Size 000 (3.5 centimeters)
6 kg	4 mo	Size 000 to 00 (3.5 to 5 centimeters)
7 kg	6 mo	Size 000 to 00 (3.5 to 5 centimeters)
8 kg	8 mo	Size 000 to 00 (3.5 to 5 centimeters)
9 kg	10 mo	Size 000 to 00 (3.5 to 5 centimeters)
10 kg	1 y	Size 00 (5 centimeters)
11 kg	1 y 6 mo	Size 00 (5 centimeters)
12 kg	2 y	Size 0 (5.5 centimeters)
13 kg	2 y 4 mo	Size 0 (5.5 centimeters)
14 kg	2 y 8 mo	Size 0 (5.5 centimeters)
15 kg	3 y	Size 1 (6.5 centimeters)
16 kg	3 y 6 mo	Size 1 (6.5 centimeters)
17 kg	4 y	Size 1 (6.5 centimeters)
18 kg	4 y 6 mo	Size 1 (6.5 centimeters)
19 kg	5 y	Size 1 (6.5 centimeters)
20 kg	5 y 6 mo	Size 1 (6.5 centimeters)
21 kg	6 y	Size 1 (6.5 centimeters)
22 kg	6 y 4 mo	Size 1 (6.5 centimeters)
23 kg	6 y 8 mo	Size 1 (6.5 centimeters)
24 kg	7 y	Size 2 (8 centimeters)
25 kg	7 y 4 mo	Size 2 (8 centimeters)
26 kg	7 y 8 mo	Size 2 (8 centimeters)
27 kg	8 y	Size 2 (8 centimeters)
28 kg	8 y 4 mo	Size 2 (8 centimeters)
29 kg	8 y 8 mo	Size 2 (8 centimeters)
30 kg	9 y	Size 2 (8 centimeters)
31 kg	9 y 4 mo	Size 2 (8 centimeters)
32 kg	9 y 8 mo	Size 2 (8 centimeters)
33 kg	10 y	Size 2 (8 centimeters)
34 kg	10 y 3 mo	Size 2 (8 centimeters)
35 kg	10 y 6 mo	Size 2 (8 centimeters)
36 kg	10 y 9 mo	Size 2 (8 centimeters)
37 kg	11 y	Size 2 (8 centimeters)
38 kg	11 y 4 mo	Size 2 (8 centimeters)
39 kg	11 y 8 mo	Size 2 (8 centimeters)
40 kg	12 y	Size 2 (8 centimeters)

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Values imported unchanged on 2026-11-04. Independent verification against official sources is in progress (see Methodology).

Last updated: 2026-11-04