Final answer:
Consistent lack of diaper changes in an 18-month-old toddler is a potential indication of physical neglect and should be addressed by a community health nurse.
Step-by-step explanation:
In assessing an 18-month-old toddler in a community day care, a community health nurse should identify consistent lack of diaper changes as a potential indication of physical neglect. This neglect could be due to various factors such as cultural values, standard of care in the community, or poverty that impact parents' abilities to provide appropriate care. A nurse's recognition of such signs is crucial for intervening appropriately and ensuring the well-being and safety of the child.