1. The development of the fetus at three months of pregnancy. The fetus at three months of pregnancy has begun to have a distinct human shape, with a length of about 7.5 cm and a weight of about 14 grams. At this time, the fetal heart has been fully formed and can beat independently, and the fetal liver, kidneys, lungs, digestive and other organs have also begun to develop. At the same time, the fetus\’s limbs and head gradually become more complete. 2. What issues should a fetus in three months of pregnancy pay attention to? 1. Diet and nutrition: Mothers should ensure that they take in enough nutrients.