Illustration of fetal development: The six-month-old fetus develops at different stages of pregnancy, and the growth and development process of the fetus is also different. This article will elaborate on the development process of the six-month-old fetus from four aspects: fetal body structure development, organ system development, nervous system development and fetal mobility development. The fetal body structure develops in the twentieth week of pregnancy. The fetus has grown to about 30 centimeters and weighs about