⇒Vitamin B-12 deficiency tied to neural tube birth defects - USATODAY.com Pregnant women who don't get enough vitamin B-12 may have a greater risk of delivering a baby with birth defects, a study shows. In a study of nearly 1,200 women in today's Pediatrics, women with the lowest B-12 levels were five times as likely to have a baby with a neural tube defect compared with mothers with the highest l