How big should a 36-week fetus be?

Patient's question:

Doctor, hello! Please help me review the ultrasound report and answer my questions. Thank you! I'm only 36 weeks pregnant, but the placenta is already Grade III+. What are the effects of the placenta maturing too quickly? How much does the fetus weigh now? Can you tell me how likely it is for me to have a vaginal birth?
Fetal Position: LOA
Fetal Heart Rate and Movement: Detectable, 142 bpm
Biparietal Diameter: 9.1 cm
Femur Length: 6.8 cm
Placenta: Anterior wall
Grading: Grade III+
Amniotic Fluid: Maximum level at 4.6 cm

Doctor's answer:

A normal fetus at 36 weeks of gestation weighs approximately 2500g, which is about 5 jin. Based on the ultrasound results, the weight can be calculated.
BDP: Biparietal diameter
AC: Head circumference
HC: Abdominal circumference
FL: Femur length
1 Fetal weight (g) = 1.07 × BPD × BPD × BPD + 0.3 × AC × AC × FL (unit: cm), which means your baby's weight is approximately 2665g, a little more than 5 jin.
Don't worry, your baby's weight is within the normal range. It is recommended to have regular prenatal check-ups. Wishing you health!

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