What is the normal biparietal diameter (BPD) at 37 weeks of pregnancy?

Some pregnant women have a normal fetal biparietal diameter (BPD) after conception, while others do not. Consequently, many patients begin researching the normal BPD value at 37 weeks of gestation. So, what is the normal BPD value at 37 weeks?

What Is the Normal Biparietal Diameter at 37 Weeks of Pregnancy?

At 37 weeks of gestation, the normal BPD typically ranges from 8.37 cm to 9.63 cm. Variations in BPD may be influenced by fetal development and genetic factors; minor fluctuations within this range are generally considered normal. However, significantly larger or smaller measurements may indicate an abnormality, and prompt medical evaluation under a physician’s guidance is recommended. Since 34 weeks marks the beginning of the third trimester, pregnant women should maintain a balanced diet and avoid cold, raw, or spicy foods. By this stage, fetal development is nearly complete; some women may experience uterine tightening or hardness. Therefore, adequate rest—especially bed rest when appropriate—is advised, along with regular prenatal check-ups. If vaginal spotting (“show”) or regular uterine contractions occur, immediate hospital admission for possible cesarean delivery is recommended.

Pregnancy-related precautions: The first prenatal visit should be scheduled early to confirm gestational age, estimate the due date, and develop a comprehensive prenatal care plan. Folic acid supplementation may continue through the first trimester (up to 12 weeks). Pregnant women should avoid exposure to toxic or hazardous substances and pets, and refrain from unnecessary medications or vaccines, as these may adversely affect fetal development. Unhealthy lifestyle habits must be corrected, and adequate nutrition must be ensured throughout pregnancy.

During pregnancy, women should follow a light, nutritious diet to ensure balanced and sufficient nutrient intake. We hope this article has been helpful to you!