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.
Vitamins B supplements can be purchased alone or in combination with other vitamins in capsule form. Click here for great prices on Vitamin B Supplements. Good food sources of the B vitamins include liver, meat, turkey, whole grains, potatoes, bananas, chillies, legumes, nutritional yeast and molasses.