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.
*This includes sources of vitamin B6 from food and supplements. The best sources of vitamin B 6 include meat, fish, poultry, organ meats, enriched cereals and meatless soy products, nuts, lentils and some vegetables and fruit. The following table will show you foods rich in vitamin B 6. 100.