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Developmental regression is when a child loses an acquired function or fails to progress beyond a prolonged plateau after a period of relatively normal development.[clarification needed][1] Developmental regression could be due to metabolic disorders,[2] progressive hydrocephalus, worsening of seizures, increased spasticity, worsening of movement disorders or parental misconception of acquired milestones. The timing of onset of developmental regression can be established by repeated medical evaluations, prior photographs and home movies. Whether the neurologic decline is predominantly affecting the gray matter or the white matter of the brain needs to be ascertained. Seizures or EEG changes, movement disorders, blindness with retinal changes, personality changes and dementia are features suggestive of grey matter involvement.[1]

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  1. ^ a b Bradley, Walter. Neurology in clinical practice. Expert Consult.
  2. ^ Sreekantam, Srividya; Wassmer, Evangeline (2013). "An approach to developmental regression". Paediatrics and Child Health. 23 (6): 273–277. doi:10.1016/j.paed.2012.12.004.