This is a popular search.
First, we can look developmentally. The Visible Embryo doesn't show a 13-weeker, but does show 12 weeks and 14 weeks.
At 12 weeks, "Sucking muscles of mouth fill out cheeks, tooth buds continue to develop and salivary glands begin to function. Scalp (hair) pattern is discernible." The fetus is breathing in and out the amniotic fluid, which helps the lungs to develop. The heart is pumping about 25 quarts of blood every day. The external sex organs are well-enough developed for an observer to determine the sex. "Arms have almost reached final proportion and length, though legs are still quite short relative to fetus' body. Hands, particularly the thumbs, become more functional." Sweat glands have appeared, and the fetus starts growing body hair.
Twelve weeks marks the transition from embryo to fetus, in that now all the structures of the body are in place. They only need to mature.
Over at About.com is a collection of links to ultrasounds of 13-week fetuses. Here is an image of a sound, entact 13-week fetus. Here is a detail of the foot. Here is another entact 13-week fetus, with details labeled.
Now, for those with strong stomachs, we can look at what an abortion does to that fetus. I couldn't find any 13-week fetuses, but I did find this medical illustration of how an abortion is performed at 14 weeks. I'm having a terrible time trying to find clearly labeled 13-week aborted fetuses. For some reason, there's a gap in proper labeling between 11 weeks and about 18 weeks among people posting this sort of picture. You can see the results of an 11-week abortion (VERY GRAPHIC!) here.
Now let's look at the mothers. Here are women who suffered fatal abortions at 13 weeks:
Gail Roe, Brenda Banks, and Suzanne Logan.
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