Folding So far, embryo has been living on stored energy in egg. Now, it begins to feed on mother's tissues through placenta. At end of 8 weeks, embryo is about 1 inch in length, weighs 1 gram, all organs are already visible. Heart is the size of a poppy seed, and has begun to beat. Embyro is about 1 inch long .
Fingers are visible but still connected by webbing.
Veins are visible. Heart has divided into left and right chambers. Fetus is about 3 inches long and fully formed. Swallowing and kicking begin. All organs and muscles are formed and beggining to function.