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.
Vitamin B-12 is found primarily in protein foods, although some nonprotein foods are fortified with it. The best B-12 sources include clams and liver, as well as fish, cheese, yogurt and fortified cereals.yridoxine and Biotin. Pyridoxine, or vitamin B-6, helps your body break down protein and also play a role in cognitive development, red blood cell production and immune health. Some of the richest sources of pyridoxine include chickpeas, beef liver, tuna, salmon and chicken.