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An infant with developmental regression and involuntary movements who was found to be vitamin B12 deficient on the basis of unrecognized maternal vitamin B12 deficiency is described. The infant had a dramatic neurologic recovery after receiving vitamin B12. The case and a review of similar cases is presented.<\/jats:p>","DOI":"10.1177\/000992288602500708","type":"journal-article","created":{"date-parts":[[2007,11,26]],"date-time":"2007-11-26T17:50:16Z","timestamp":1196099416000},"page":"369-371","source":"Crossref","is-referenced-by-count":23,"title":["Developmental Regression as an Early Manifestation of Vitamin B12 Deficiency"],"prefix":"10.1177","volume":"25","author":[{"given":"P. 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