Which statement about fetal measurements is true?

• A. Fetal measurements are fixed values at a given trimester.
• B. Fetal size increases with gestational age and must be interpreted with age.
• C. Fetal size is not influenced by gestational age.
• D. Fetal size is constant after 20 weeks.

Answer: (B)

Fetal growth progresses with gestational age; ultrasound measurements such as head circumference, abdominal circumference, biparietal diameter, and femur length increase as the fetus develops, and they are interpreted against age-specific reference charts. That makes the statement about size increasing with gestational age and needing age-based interpretation the best choice. The other ideas imply fixed or constant size at certain times, or no influence of gestational age, which isn’t accurate because growth continues throughout pregnancy and varies among fetuses, requiring age-specific context for proper interpretation.