Pregnancy Information Center
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A Baby's Story: 3D Ultrasounds of Every Week
Week 21: Pregnancy Week By Week 3D Ultrasound Images
From this week on, your baby is usually measured from head to heel. Your baby should be around 10.51 inches (26.7cm) and weighs around 12.70 ounces (360 grams). His digestive system has developed enough to start absorbing small amounts of sugar from the amniotic fluid. Most of the baby’s nourishment is still through the placenta.
The bone marrow have also developed enough to contribute to blood cell formation. The liver and spleen were responsible for creating blood cells before but the liver will stop producing blood cells a few weeks before birth. The spleen stops producing blood cells around week 30.
Your baby will also start to settle in the amniotic fluid near the end of this trimester. It usually chooses a head-down position. Its hair is also rapidly developing with visible eyebrows, eyelashes and hair on the scalp.
