1. Overview of Fetal Size at 32 Weeks of Pregnancy At 32 weeks of pregnancy, the fetus has developed quite well, and all parts of the body have gradually matured. At this time, the size of the fetus is about 42 cm and the weight is about 1700 grams. Over the next few weeks, the fetus will continue to grow and develop further. 2. The size of the fetal head at 32 weeks of pregnancy. At 32 weeks of pregnancy, the size of the fetal head is already compared with the body.