According to My Baby Center:
You're halfway there! The top of your uterus now reaches your belly button and will grow about a centimeter per week. Your baby is about 9 inches long and weighs about 8 ounces. (9 inches already!? Wow!)
She has started to swallow amniotic fluid, and her kidneys continue to make urine. Hair on the scalp is sprouting. ( We watched Olivia do this on the ultrasound, she drinks just about as much water as I do. Scott says she's practicing chatter. I punch him when he says this :) )
Sensory development reaches its peak this week. The nerve cells serving each of the senses taste, smell, hearing, seeing, and touch are now developing in their specialized areas of the brain. Nerve cell production slows down as existing nerve cells grow larger and make more complex connections. If you're carrying a baby girl, she already has roughly 6 million eggs in her ovaries. But since most of them will disintegrate during gestation, by the time she's born, she'll have about a million.
You no doubt feel the kicking and somersaulting of your growing baby. At times, she may be so mobile that you can't sleep. The next ten weeks or so will be your baby's busiest and most active time, until the womb gets too crowded. (Olivia is most active in the early morning to the point I wake up from it, and again when we are in the evening bath and lounging on the bed after. I actually got to see my belly move from her the other night while in the tub.)
I can feel it, but Scott still can't. For some reason she quits moving when he puts his hand on my belly. Scott says that contrariness just makes her my child. He's actually a little disappointed, but at least he doesn't think it's a big conspiracy to get him to empty catboxes.