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Hempill-Bryant explains that babies born to B12 deficient mothers will also be deficient in B12, especially if they are then exclusively breastfed. A study in the Journal of Child Neurology found that the most severe cases of B12 deficiency can lead to weakness, failure to thrive, afebrile seizure, developmental delay, nystagmus, tremors, and involuntary movement among young babies

CBTRUS statistical report: primary brain and other central nervous system tumors diagnosed in the United States in 20152019

They may be a good option if you want a quick visit without a full IV drip

Granhall C, Sondergaard FL, Thomsen M, Anderson TW