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.
[accessed March 22, 2012]. The best sources of Vitamin B 12 include: eggs, milk, cheese, milk products, meat, fish, shellfish and poultry. Some soy and rice beverages as well as soy based meat substitutes are fortified with vitamin B12.To see if a product contains vitamin B 12 check the Nutrition Facts on the food label.The following table shows you which foods are sources of vitamin B 12.he best sources of Vitamin B 12 include: eggs, milk, cheese, milk products, meat, fish, shellfish and poultry.