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But, if a consistent supply of B12 is not available (which is the case in exclusively breastfed infants of B12-deficient mothers), B12 stores become depleted in the baby by 4 to 7 months of age

Broadhouse et al., 2020

doi: 10.1016/S0140-6736(15)60696-1 301

Lower Circulating B12 Is Associated with Higher Obesity and Insulin Resistance during Pregnancy in a Non-Diabetic White British Population Low serum vitamin B-12 and folate concentrations and low thiamin and riboflavin intakes are inversely associated with greater adiposity in Mexican American children Serum concentrations of vitamin B-12 and folate were inversely associated with BMI