Which age range is NOT correctly associated with infants?

The age range that is not correctly associated with infants is from 12 to 18 months old. Infancy is typically defined as the period from birth up to about 12 months of age. The transition from infancy to toddlerhood generally occurs around the one-year mark. Therefore, once a child reaches 12 months, they are considered to be in the toddler stage rather than still being classified as an infant.

The other options accurately fall within the commonly accepted age range for infants; 0 to 6 months and 1 to 12 months include the infant stage, while 3 to 12 months also overlaps significantly and still generally pertains to the latter months of infancy before transitioning to toddlerhood. Thus, the range of 12 to 18 months distinctly does not align with the definition of infant.