The Baby's Exact Size
Eight weeks after your last menstrual period, your embryo is almost exactly six weeks from the date of his conception. At the beginning of the eighth week, he is about .6 inches long. By the beginning of the ninth week, he is likely to acheive a length of .8 inches. Although still small, he is large enough that you could see individual features with a naked eye.
An Eight-Week-Old Baby is the Size of...
Numbers can't always enable accurate visualization, but comparison might help. In the eighth week of pregnancy, your baby is about the same size as a kidney bean or your own thumbnail. Eight-week-old embryos are about as long as a dime at the beginning of the week and a nickel by the end of the week. She also weighs about the same as a bean.
What the Baby Looks Like
Your unborn baby now has an undeniably human appearance, although she's still far from looking like a "real" baby. She has small hands and feet with tiny, webbed fingers and toes. She has primitive eyes covered by unopened eyelids, and you would be able to discern a face if you looked at her directly. Inside, her organs are developing; she has a primitive digestive tract, lungs, circulatory system and central nervous system. She has a brain, and her heart is pumping blood through her body at 140 beats per minute.