Your fundal height measurement should roughly equal the number of weeks you’ve been pregnant. For example, if you’re 20 weeks pregnant, your health care provider would expect your fundal height to be somewhere between 18-22 centimeters. It isn’t unusual, however, to measure somewhat smaller or larger than expected. Individual body types and factors such as a full bladder or carrying multiples, can affect fundal height measurements. Some medical reasons fundal heights may be greater or smaller than expected include:
• Fetal growth that is too slow or too rapid
• Too much or too little amniotic fluid
• Uterine fibroids
• A baby prematurely descending into the pelvis or settling into a breech or other unusual position
It is important to remember that fundal height is only a tool for evaluating fetal growth. It is not an exact science. Typically, fundal height measurements reassure you and your provider about your baby’s steady development. However, there are individual variations and no two babies are exactly the same. So if your measurements are a bit more or less than what you might expect, don’t worry. However, if you are concerned about your fundal height measurements, make sure you talk to your health care provider. There are other prenatal tests that can be done to assure you that your baby is doing well and growing as he or she should be.