At what stage of gestation does the fetus begin swallowing amniotic fluid?

The correct answer is 12 weeks, as this is the point in gestation when fetal swallowing of amniotic fluid can be observed. By this stage, the developing fetus has reached a level of maturity where the digestive system starts to function and the fetus engages in the process of swallowing. This is significant because swallowing amniotic fluid is essential for normal development, contributing to the development of the gastrointestinal tract and facilitating the organ systems' maturation.

At 12 weeks, the fetus has also developed the necessary reflexes and coordination to engage in this activity. Swallowing amniotic fluid helps with lung development and prepares the fetus for survival outside the womb, as it supports the amniotic fluid's role in cushioning and creating a stable environment.

Understanding the timing of such developmental milestones is crucial for recognizing typical fetal growth patterns and identifying any potential issues in prenatal development.