Developmental delay is defined as failure to meet expected developmental milestones in one or more of the following areas: physical, social, emotional, intellectual, speech and language and/or adaptive development (sometimes called self-help skills, which include dressing, toileting, feeding, etc).
These delays are diagnosed when a child performs approximately 25 to 30 percent below age norms in one or more of these areas (with adjustment for prematurity in affected children). Progress occurs at a slower than expected rate following the anticipated sequence. Various medical and environmental causes exist.
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