7 weeks

from smartmamma.com:
Your baby is now approximately ½ an inch long, about the size of a raspberry. As he grows, the small tail that extends from his tailbone is shrinking. This week, his elbows are forming and he is bending, flexing, and moving around, making tiny jerky motions. You won’t be able to feel these movements for quite a few weeks though, because he is too small.
His fingers are starting to develop out of their buds and feet are beginning to appear. Toes will start to grow soon. Although he still looks alien, his eyes, ears, and nose are beginning to form.In his oversized head, his brain is developing into two hemispheres. Teeth begin to develop already under the gums, and baby’s skin is paper-thin. If you were to peer inside your womb, you would be able to see his blood vessels and organs beginning to form through his skin. Speaking of organs, he has started to develop an appendix and pancreas. His liver is producing red blood cells, and his intestine is looping into the umbilical cord. Although the intestines start in the umbilical cord, they eventually all move into the baby’s body.

i guess its just me, but i still have a difficult time saying the baby is 7 weeks in development. in my opinion he/she should be considered 5 weeks. why do they count the 2 weeks prior to conception? the baby wasnt even formed at that time! oh well, i guess its just one of those mysteries i'll never understand. at any rate its exciting to read about the changes taking place this week!