Fetal development - 18 weeks pregnant
Your baby is approximately 6 inches/ 14.2 centimeters long from crown to rump and she weighs about 7 ounces/ 190 grams. Her chest moves up and down to mimic breathing but she's not taking in air, only amniotic fluid.
Ultrasound scans in the second trimester 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 these scans, you might see your baby kick, flex, reach, roll or even suck her thumb. Bring your husband along, and whether or not he's able to accompany you, make sure you 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 recognisable. If you are carrying more than one baby, check out our section on twins or more.
• Note: Experts say every baby develops differently - even in utero. These fetal development pages are designed to give a general idea of how a fetus grows in the womb.
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