Why are fetuses big at the head and small at the feet?

Patient's question:

I am currently 28 weeks pregnant. The color Doppler ultrasound shows a biparietal diameter of 7.6 and a femur length of 4.2.

Doctor's answer:

Hello, according to your ultrasound report, the development indicators of the fetus are normal.
There are several formulas for estimating fetal weight:
Formula 1: Y = 260.69HC - 4973.72
Formula 2: Y = 171.48AC - 2686.60
Formula 3: Y = 747.42FL - 2232.56
Where Y is the fetal weight, measured in grams (g). AC is the abdominal circumference, HC is the head circumference, and FL is the femur length, measured in centimeters (cm).

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