According to Bartholomew's rule, if the fundus is at the level of the umbilicus, the age of gestation is:

Explanation

•Bartholomew's rule of fourths is a method used to determine the estimated age of gestation of pregnancy in relation to the fundal height. In this method all you need to do is to remember 3 landmarks: the symphisis pubis, the umbilicus and the xiphoid process.

•When the fundus is at the level of:

Symphisis pubis - 12 weeks

Midway between symphysis pubis and umbilicus - 16 weeks

Umbilicus - 20 weeks

Xiphoid process - 36 weeks-38 weeks