17 Oct 2014 Blackmores Institute VitaminB12 deficiency in pregnancy worse than thought 17 Oct 2014 Share Share on LinkedIn Share on Facebook Share on Twitter Share on Google+ Share on Pinterest News Almost half of all pregnant women are deficient in vitamin B12 leaving their babies exposed to potential developmental problems, according to a recent study published in the journal Clinical Biochemistry. Symptoms of vitamin B12 deficiency in neonates may include developmental delay, failure to thrive and similar non-specific symptoms that may result in problematic or delayed diagnosis. × To continue reading this article, please Log In or Sign Up for access.