Your baby resembles a tadpole more than a human, but is growing fast. The circulatory system is beginning to form, and the tiny heart will start to beat this week. Your baby is the size of a sesame seed. Read about your pregnancy at 5 weeks.
Stores of B12 can last for up to a year. Foods high in Vitamin B12 include shellfish, liver, fish, crab, fortified soy products (tofu, soymilk), fortified cereals, red meat, low fat dairy, cheese, and eggs.
Vegetable and Plant Sources. Certain fruits, vegetables, nuts and legumes are good sources of vitamin B; however, they do not contain significant amounts of B12 that is found in meat and dairy foods. Avocado, pomegranate, dates, watermelon, and some berries are especially high in B-complex vitamins.oth wild-caught and farm-raised salmon, trout, catfish, tuna, halibut, cod and many other fish varieties contain large amounts of B-complex vitamins. Lamb is another good source of vitamin B and protein as are beef, poultry, shellfish, eggs, and dairy products.