General information only — not medical advice. This page provides general, well-established information about pregnancy development and is intended for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your qualified healthcare provider with any questions about your pregnancy.

31 Weeks Pregnant

Q: What trimester is week 31 of pregnancy?

Week 31 falls in the Third Trimester. The first trimester covers weeks 1–13, the second trimester covers weeks 14–27, and the third trimester covers weeks 28 through delivery. This is a general informational guide — consult your healthcare provider for personalized guidance about your pregnancy.

Q: How many weeks are left at 31 weeks pregnant?

At 31 weeks pregnant, there are approximately 9 weeks remaining until the estimated due date (based on a standard 40-week pregnancy). Individual pregnancies vary — due dates are estimates, and normal delivery typically occurs between weeks 37 and 42. Always consult your healthcare provider for information specific to your pregnancy.

Third Trimester — ≈9 weeks to go

Week 31 Week 40 (due date)

Week 31 falls in the Third Trimester — ≈9 weeks to go. A standard pregnancy is counted as 40 weeks from the last menstrual period. Individual pregnancies vary — due dates are estimates, and normal delivery typically occurs between weeks 37 and 42.

Development at 31 Weeks

During week 31, the lungs are almost fully developed. Weight gain is typically accelerating. Movements are strong and often noticeable. The fetus is approximately the size of four navel oranges. The baby's brain is making billions of neural connections. Reflexes are becoming more sophisticated as the nervous system continues to mature.

Size Comparison

Approximate size — week 31

Four navel oranges

Common Experiences at 31 Weeks

Around week 31, many people notice the baby's movements are strong. Shortness of breath, swelling, and back discomfort are common. Sleep can be challenging. Many people begin thinking about the hospital bag, newborn care, and other preparations. Checking in with a provider regularly is important during the third trimester.

Experiences vary widely between individuals. If you have concerns about any symptom, contact your healthcare provider.

General Planning Checklist — Week 31

These are general planning suggestions only — not medical instructions. Follow your healthcare provider's specific guidance for your pregnancy.

Continue routine third-trimester prenatal appointments
Discuss birth location and support person plans with your provider
Begin gathering items for a hospital or birth bag if relevant
Discuss any labor signs to watch for with your provider

Nearby Weeks

29 Weeks Pregnant · 30 Weeks Pregnant · 32 Weeks Pregnant · 33 Weeks Pregnant

Frequently Asked Questions

What trimester is week 31 of pregnancy?

Week 31 is in the Third Trimester — ≈9 weeks to go. The first trimester covers weeks 1–13, the second trimester covers weeks 14–27, and the third trimester covers weeks 28 through delivery. This is general information — your healthcare provider can give you guidance specific to your pregnancy.

How many weeks are left at 31 weeks pregnant?

Based on a standard 40-week pregnancy, week 31 means approximately Third Trimester — ≈9 weeks to go with time remaining as noted above. Keep in mind that due dates are estimates — normal delivery typically occurs between weeks 37 and 42. Always follow your healthcare provider's guidance about your specific pregnancy.

Not medical advice. The information on this page is for general informational purposes only. Pregnancy experiences vary significantly between individuals. Nothing on this page should be used as a basis for medical decisions. Always consult a qualified healthcare provider for advice about your specific pregnancy, symptoms, or health concerns. In an emergency, contact emergency services immediately.