In which trimester does the abdomen start to protrude?

The abdomen typically begins to protrude noticeably during the second trimester of pregnancy. This phase, which spans from weeks 13 to 26, is marked by significant physical changes, including the expansion of the uterus as the baby grows. While some women may experience slight changes in their abdominal shape during the first trimester, the increase in size becomes more pronounced in the second trimester as the body begins to accommodate the developing fetus. The third trimester continues this trend, with the abdomen becoming even larger as the baby approaches full term. The fourth trimester refers to the period immediately following birth, where the focus is on recovery and the body’s transition, rather than on the growth of the fetus. Therefore, the correct understanding places the noticeable protrusion of the abdomen in the second trimester.