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Fetal Size: Length, 4 to 4 1/2 inches, crown to rump; weight, 1 3/4 ounces.
Fetal Development Milestones: Baby's skeletal system is continuing to develop. Characteristic hair patterns on the scalp are taking shape.
What You're Seeing: In this 3-D image, the baby-to-be is curled up, her hands covering her face (she's about the size of a grapefruit). The large bones that make up her skull are forming and hardening. As they harden, the bones appear whiter and brighter in the image. These cranium pieces do not come together until well after birth.
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