For which of the following age groups is it necessary to carry two sizes of oropharyngeal airways?

Carrying two sizes of oropharyngeal airways for children is necessary due to the significant variations in anatomical sizes and shapes within this age group. Children are not a homogeneous category; their airways can differ substantially as they grow and develop. This necessitates having both smaller and larger oropharyngeal airways to ensure that the airway device fits appropriately, which is crucial for effective ventilation and maintaining an open airway.

Using a correctly sized oropharyngeal airway helps prevent complications such as airway obstruction or trauma to the airway structures. Newborns, infants, and adults typically require only one size because their anatomical features are less variable within each of those groups compared to children. By having two sizes available specifically for children, it enhances the ability to provide adequate care in emergencies.