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.

18 Weeks Pregnant

Q: What trimester is week 18 of pregnancy?

Week 18 falls in the Second 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 18 weeks pregnant?

At 18 weeks pregnant, there are approximately 22 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.

Second Trimester — ≈22 weeks to go

Week 18 Week 40 (due date)

Week 18 falls in the Second Trimester — ≈22 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 18 Weeks

Around week 18, the baby is typically very active, with yawning, stretching, and other movements occurring regularly. Hearing is developing, and the baby may begin to respond to sounds from outside the womb. The anatomy scan is commonly scheduled between weeks 18 and 20. The fetus is roughly the size of a sweet potato.

Size Comparison

Approximate size — week 18

Sweet potato (~14 cm)

Common Experiences at 18 Weeks

Around week 18, many people are clearly visibly pregnant. The anatomy scan is often approaching, which many find an emotional milestone. Some people experience a sense of feeling the baby move more definitively around this time. Back comfort may become more of a consideration as the belly grows.

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

General Planning Checklist — Week 18

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

Schedule the anatomy scan (typically 18–20 weeks) with your provider
Prepare questions about what the anatomy scan will assess
Continue routine prenatal appointments
Discuss any symptoms or concerns with your healthcare provider

Nearby Weeks

16 Weeks Pregnant · 17 Weeks Pregnant · 19 Weeks Pregnant · 20 Weeks Pregnant

Frequently Asked Questions

What trimester is week 18 of pregnancy?

Week 18 is in the Second Trimester — ≈22 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 18 weeks pregnant?

Based on a standard 40-week pregnancy, week 18 means approximately Second Trimester — ≈22 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.