Background: Vitamin B12 has a quite important function in the process of fat, carbohydrate and protein metabolism of the human organism. Because of its producing is not possible in the human organism, the vitamin should be taken by food which they are animal products.
Case Presentation: We aimed to draw attention to that it is one of the preventable cause of neurodevelopmental retardation of vitamin B12 deficiency with 2 cases presentation whose presented with complaints of delay to tonic neck reflex and delay of ability the sit with support and they were quickly recovered after diagnosed and treated for vitamin B12 deficiency.
Conclusion: Level of B12 which may be the cause of permanent neurological damages, can be necessary detected in pregnant women and infancy, in this way, the neurological morbidity of due to B12 deficiency can be prevented with early diagnosis.
Key words: Neurodevelopmental retardation; swallowing disorder; vitamin B12
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