Introduction

The vitamin B₁₂ (B₁₂) status of babies depends largely on maternal B₁₂  status pregnancy,during pregnancy and on lactation if exclusively breast fed. Physiological changes during pregnancy makes laboratory assessment of B₁₂ status challenging and B₁₂ -deficient states can be masked by irondeficiency. We present a case of a baby with severe B₁₂ deficiency whose mother was also deficient.

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