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Little Children, Bigger Problems: Anti-N-Methyl D-Aspartate Receptor Encephalitis! Anti N-methyl D-aspartate receptor (NMDAR) antibody positive autoimmune encephalitis is a well-described entity both in adults as well as in children. The authors report an 18-mo-old boy who presented with seizures, movement disorder, cognitive impairment, and behavioral disturbances. Anti-NMDAR encephalitis was confirmed by detection of NMDAR antibodies in the cerebrospinal fluid. The patient was administered pulse corticosteroids and intravenous immunoglobulin followed by further immunomodulatory therapy. No tumor was detected on screening. The child remained unresponsive to treatment. The authors wish to highlight the occurrence of anti-NMDAR encephalitis in young toddlers and the poor response to therapy often seen in very young children.