My favorite thing about the pregnacy books is that they constantly refer to size of the baby by food. When I was about 7 weeks along it was the size of a grain of rice. 8-9 wks. the size of a peanut. 10-11 wks. the size of a peanut still in the shell (or a walnut, depending on the book) Around 12 wks, it switched to fruit - for a while it was the size of a strawberry. Now at 14 wks. it is the size of a jumbo shrimp.