Halfway There

You're halfway there! The top of your uterus now reaches your belly button and will grow about a centimeter per week. The fetus measures around 6 inches/ 15 centimeters long from crown to rump and weighs about 9 ounces/ 240 grams.

She has started to swallow amniotic fluid, and her kidneys continue to make urine. Hair on the scalp is sprouting.

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 six million eggs in her ovaries. By the time she's born, she'll have about one million.

You may have felt the kicking and somersaulting of your growing baby. At times, you might find that she is 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.

Source: http://www.babycenter.com.ph/pregnancy/fetaldevelopment/19weeks/