What size endotracheal tube is typically used when orally intubating a full-term newborn?

When orally intubating a full-term newborn, the typical size of the endotracheal tube is in the range of 3.0 to 3.5 mm. Newborns have smaller airways compared to older children and adults, so it is essential to use a tube size that fits their anatomical structure while also allowing for effective ventilation. The choice of tube size is crucial; using a tube that is too large can cause trauma to the airway and may lead to complications such as airway obstruction or injury.

In practice, 3.0 mm is often recommended as a standard size for a full-term newborn, while a 3.5 mm tube can be used if the newborn is larger or if there are specific clinical indications suggesting a need for a larger size. Therefore, the correct answer reflects the typical size range used for this population, ensuring that airway management is performed within the safety standards necessary for newborn patients.