Unless you’re a vegan, you should have no problem getting the recommended 3 mcg of B12 per day. Vitamin B12, also known as cobalamin, is found exclusively in animal products: milk, meat, shellfish, and eggs. B12 also helps with the metabolism of folate. Symptoms of B12 deficiency, such as poor neurological development, can show up in the breastfed infants of strict vegans. Interestingly, a 2011 study found that moms with high levels of B12 in the first trimester of pregnancy were eight times less likely to have infants with colic. B12 is linked to neurological development in utero, and levels of vitamin B12 appear to inhibit the release of melatonin, the hormone that helps babies (and adults) regulate their sleep cycles. B12 deficiency in utero ha also been linked to the development of depression later in life, gastric diseases and learning and developmental delays. If you are a vegan, talk to your care provider about B12 supplement options. Yeast extract spreads such as Marmite are also high in B12.