After approximately which week does the fetus become a major contributor to amniotic fluid through urination and swallowing?

After approximately which week does the fetus become a major contributor to amniotic fluid through urination and swallowing?

• A. 12 weeks
• B. 14 weeks
• C. 16 weeks
• D. 18 weeks

Answer: (C)

As gestation progresses, the source of amniotic fluid shifts from mainly maternal contributions to fetal production. The fetus starts swallowing amniotic fluid early on, around 11 weeks, which helps regulate volume, but the kidneys don’t yet dominate. By mid-pregnancy, fetal urine production increases substantially and becomes the principal source of amniotic fluid. Around 16 weeks is when this fetal urine contribution is large enough to be considered the major source, with swallowing continuing to help maintain balance. Therefore, the best answer is 16 weeks.

As gestation progresses, the source of amniotic fluid shifts from mainly maternal contributions to fetal production. The fetus starts swallowing amniotic fluid early on, around 11 weeks, which helps regulate volume, but the kidneys don’t yet dominate. By mid-pregnancy, fetal urine production increases substantially and becomes the principal source of amniotic fluid. Around 16 weeks is when this fetal urine contribution is large enough to be considered the major source, with swallowing continuing to help maintain balance. Therefore, the best answer is 16 weeks.