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Fetal Size: Length, 8 1/2 inches, crown to rump; weight, 11/4 pounds.
Fetal Development Milestones: Baby-to-be is capable of reacting to noise with a blink-startle response. Her lungs are developing.
What You're Seeing: The image on the left shows a magnified view of the four chambers of the baby-to-be's heart. The image on the right show's blood flowing from the upper chambers of the heart (the atria) into the lower chambers of the heart (the ventricles). The walls of the ventricles are more muscular than the atria, because they have to pump blood to the baby's lungs and the rest of the body.
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