What is an expected finding of the olfactory nerve in infants?

The expected finding of the olfactory nerve in infants is that it is often difficult to test. This stems from several factors related to infant development. Infants may not have developed the ability to communicate their olfactory experiences effectively, making it challenging for clinicians to assess their sense of smell accurately.

Additionally, the olfactory nerve and its pathways are still maturing during infancy. While newborns have some degree of olfactory function and can react to certain smells, such as a preference for sweet scents (like breast milk), formally testing their ability to identify or differentiate smells isn't feasible in the same manner as it is with older children or adults. Therefore, recognizing that testing this nerve is difficult captures the essence of its expected findings in infants.

The other options suggest varying degrees of olfactory function that are not typically demonstrable in infants, as their neural and sensory systems are still developing.