At which stage of pregnancy should fetal movements typically become noticeable to the mother?

Fetal movements, often referred to as "quickening," typically become noticeable to the mother during the second trimester of pregnancy. This stage usually occurs around 18 to 20 weeks for first-time mothers, although some may feel movements a bit earlier.

The reason for this timing is related to the development and growth of the fetus. By the second trimester, the fetus has grown sufficiently in size and strength, allowing it to engage in movements that can be felt by the mother. The amniotic fluid also provides a cushioning effect that can amplify these sensations.

In contrast, during the first trimester, the fetus is still very small and primarily engaging in subtle movements that the mother is unlikely to feel. By the third trimester, although fetal movement is often more vigorous and noticeable, the question specifically asks for the stage when the mother first recognizes these movements, which is established during the second trimester. Thus, the second trimester is the correct answer as it marks the period when mothers typically begin to feel and recognize fetal movements.