In the third trimester, which statement about maximum fetal size is accurate?

In the third trimester, which statement about maximum fetal size is accurate?

• A. Maximum size is reached by 28 weeks.
• B. Crown-heel length cannot exceed 40 cm.
• C. Head circumference cannot exceed 30 cm.
• D. There is no fixed maximum; size continues to grow with gestational age.

Answer: (D)

In the third trimester, fetal size keeps increasing as gestation advances; there isn’t a universal cap on how large a fetus can get. Growth continues until birth, with all major measurements—head size, abdominal size, and limb length—generally expanding as the baby develops. That’s why saying there’s a fixed maximum at a certain week or a specific centimeter limit isn’t accurate. The concept to hold is that there is no fixed maximum size—the fetus grows with gestational age. The other statements imply rigid cutoffs (reaching maximum size by a particular week or a fixed measurement such as crown-heel length or head circumference), but these do not reflect how fetal growth progresses in late pregnancy. While individual fetuses can vary—some being smaller or larger due to circumstances—there isn’t a single upper bound that applies universally.

In the third trimester, fetal size keeps increasing as gestation advances; there isn’t a universal cap on how large a fetus can get. Growth continues until birth, with all major measurements—head size, abdominal size, and limb length—generally expanding as the baby develops. That’s why saying there’s a fixed maximum at a certain week or a specific centimeter limit isn’t accurate. The concept to hold is that there is no fixed maximum size—the fetus grows with gestational age.

The other statements imply rigid cutoffs (reaching maximum size by a particular week or a fixed measurement such as crown-heel length or head circumference), but these do not reflect how fetal growth progresses in late pregnancy. While individual fetuses can vary—some being smaller or larger due to circumstances—there isn’t a single upper bound that applies universally.