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Fundal Height



I am currently 30 weeks pregnant and when I went to the doctor yesterday, my belly measurement was 34 cm. When I went to the doctor at 27 weeks, my belly measurement was 28 cm. It jumped 6 cm in 3 weeks. What could be going on with me? Could I have been wrong about my due date or could it be that I could have twins? When I had my ultrasound at 20 weeks they only showed me one baby. Can you help me understand?


Fundal height in centimeters is usually 2 cm within the gestational age in weeks (after 24 weeks of pregnancy). In a case where the fundal height is greater than expected, the possible reasons are an incorrect due date, twins, excess amniotic fluid (polyhydramnios), a large fetus or normal variation between examiners. Your 20 week ultrasound established your due date and ruled out twins. The remaining possibilities can be evaluated with another ultrasound.

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Response by:

Arthur T Ollendorff, MD Arthur T Ollendorff, MD
Associate Professor of Obstetrics and Gynecology
College of Medicine
University of Cincinnati