From: The management of unanticipated difficult airways in children of all age groups in anaesthetic practice - the position paper of an expert panel
Patient size
LMA size
Neonate, infant < 5 kg
1
Infant 5–10 kg
1.5
Infant, child 10–20 kg
2
Child 20–30 kg
2.5
Child 30–50 kg
3
Child /Adult 50–70 kg
4.0
Child / Adult 70–100 kg
5