Your baby is twice as big as he was last month but he still weighs only about 190g (6.7oz). Meanwhile, most of the weight you've gained is from amniotic fluid, placenta, and water retention. Although things may seem calm on the surface, your little one is kicking, flexing, reaching, rolling, and even sucking his thumb now. If you haven't felt him move yet, you will in the next few weeks. His hearing is now functioning and he will be listening to your heartbeat.
Your baby is approximately 6 inches/ 14.2 centimetres 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.
A mid-pregnancy ultrasound scan 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 scan, you might see your baby kick, flex, reach, roll, or even suck her thumb. Bring your partner 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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