Level 1: Physical changes at 18 weeks of pregnancy. At 18 weeks of pregnancy, the baby has grown into the size of a small watermelon, and the fetus\’s body is also developing rapidly. At this time, pregnant women may feel that their abdomen begins to bulge and their belly becomes more obvious. Pregnant women may experience frequent bathroom breaks and indigestion due to the enlargement, which puts pressure on the bladder and intestines. At the same time, pregnant women\’s breasts can also become more sensitive and swollen. Level 2: Diet that you need to pay attention to during the 18th week of pregnancy. The baby at the 18th week of pregnancy needs adequate nutrition to support it.