Is the definition for developmental delay different for infants and toddlers than it is for preschool age children?
No, the definition of developmental delay is the same for infants, toddlers, and preschoolers. A developmental delay is a significant delay in one or more areas of development as compared to other children of his or her age. Infants, toddlers and preschool children are determined to have a developmental delay if they have a delay in one or more area of development of at least 25% below their chronological age, or a score of 1.5 standard deviations below the mean on a standardized test.
