Your baby is approximately six inches long. Her chest moves up and down to mimic breathing, but she's not taking in air, only amniotic fluid.
A midpregnancy ultrasound is often done sometime in the second trimester (usually between 18 and 22 weeks) to assess fetal growth and development, screen for certain birth defects, check the placenta and umbilical cord, and determine whether the gestational age is accurate. During this exam, you might see your baby kick, flex, reach, roll, or even suck its thumb. Bring your partner along, and whether or not he's able to accompany you, make sure to ask for printouts of the baby in various poses.
If you're having a girl, the vagina, uterus, and Fallopian tubes are in place. If it's a boy, the genitals are distinct and recognizable.
