According to BabyCenter.com:
Your baby's sensory development is exploding! Her brain is designating specialized areas for smell, taste, hearing, vision, and touch. Some research suggests that she may be able to hear your voice now, so don't be shy about reading aloud, talking to her, or singing a happy tune if the mood strikes you.
Your baby weighs about 8 1/2 ounces and measures 6 inches, head to bottom — about the size of a large heirloom tomato. Her arms and legs are in the right proportions to each other and the rest of her body now. Her kidneys continue to make urine and the hair on her scalp is sprouting. A waxy protective coating called the vernix caseosa is forming on her skin to prevent it from pickling in the amniotic fluid.
Oh, Baby Center, you make me laugh. "Don't be shy about reading aloud, talking to her..." You don't know me very well because basically this poor child hears me talk, sing, laugh nonstop. When I finally fall asleep at night, Baby J probably thinks, "Thank goodness, mom. Let's take a little break from all the yapping and all get some rest."
I have no clue what an heirloom tomato is, and I distinctly remember thinking the same thing when Macey was that size. However, I'm pretty happy that his/her arms should be proportionate to the rest of the body now. I don't plan on having a little baby T-Rex.
In case you're wondering what Baby Center says about my growth, basically I'll just be getting fatter for the next 21 weeks. Should be fun!