Active baby 12 week ultrasound Two days ago I was laying in bed at night and I felt something weird in my belly. Ultrasound scan: The 12-week ultrasound, or nuchal translucency (NT) scan, measures the thickness of the fluid at the back of the baby’s neck to assess the risk of chromosomal abnormalities like Down syndrome. And baby’s brain is still developing fast! Baby’s now developing reflexes, you’ll likely see movement on ultrasounds. “You can see most anatomic structures including the fingers and toes,” says Wertheimer. On the ultrasound screen, you’ll see a small, defined figure, which is your little one! By this time, your baby has grown to about the size of a lime. First 12 weeks - slept approx 22 hours a day in his baby wrap. Happy though that it may have picked up on my anxiety and so therefore was a little more chilled out to begin with. As part of the ultrasound scan, the ultrasonographer measures the back of your baby’s Super active, the 12 week ultrasound the baby was waving and putting thumbs in the mouth, but it would not turn the right way so they could not take the measurements. Literally never relaxed. I know what gas feels like, and this was different.