Final answer:
The height of the fundus in cm at 20 weeks is approximately the same as the length of the fetus.
Step-by-step explanation:
The height of the fundus in cm at 20 weeks is approximately the same as the length of the fetus. By the end of week 38, the fetus measures about 51 cm (20 in.) long. This means that at 20 weeks, the fundus, which is the top of the uterus, will be around 20 cm above the pubic bone. The fundus height is an important measurement used to monitor the growth and development of the fetus during pregnancy.