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Vitamin B12 Status of Mothers of Children with Infantile Tremor Syndrome. Retrospective chart review of 15 patients with infantile tremor syndrome in which mothers had their serum vitamin B12 measured, showed low (<200 pg/mL) serum vitamin B12 in 9 and low-normal (<200-350 pg/mL) in 6. Of the 9 mothers who had undergone complete blood counts, anemia was present in 6 and macrocytosis in 3. Vitamin B12 deficiency appears to be common in mothers of infants with infantile tremor syndrome.