The 3D visualization reveals the human fetus at week 14 of gestation, at the very beginning of the second trimester, when the head still makes up a large share of body length but the trunk and limbs have started to lengthen rapidly. The model shows the eyes moving from the sides toward the front of the face, the ears approaching their final position, and differentiated external genitalia, while the kidneys already produce urine that contributes to the amniotic fluid. This stage marks the point at which ultrasound dating shifts from crown-rump length to biparietal diameter, head circumference, and femur length, making the model a useful reference for understanding second-trimester fetal biometry.
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