Pregnancy & parentingWomen's health

Healthy pregnancy: your third trimester guide

Understand the final milestones of prenatal development, as well as how to prepare for delivery.


LearnWomen's healthPregnancyHealthy pregnancy: your third trimester guide
Size at 28 weeks: Large eggplant
Size at 29 weeks: Butternut squash
Size at 30 weeks: Large cabbage
Size at 31 weeks: Coconut
Size at 32 weeks: Napa cabbage
Size at 33 weeks: Pineapple
Size at 34 weeks: Cantaloupe
Size at 35 weeks: Honeydew melon
Size at 36 weeks: Romaine lettuce
Size at 37 weeks: A bunch of swiss chard
Size at 38 weeks: The length of a leek
Size at 39 weeks: Mini-watermelon
Size at 40 weeks: Small pumpkin

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You’re in the last three months of pregnancy, but there’s still plenty of growing to do. Get the facts on the third trimester, including how your body is preparing for delivery.

If you have what’s considered a high-risk pregnancy, you’ll probably have seen a maternal-fetal medicine (MFM) specialist in addition to your regular healthcare provider (HCP). This may be because you are older than 35, have a history of preeclampsia) a pregnancy complication that causes high blood pressure, protein in the urine, and fluid retention), or have conditions such as diabetes, obesity, or high blood pressure.

Sources: National Library of Medicine. MedlinePlu... + 8
  1. National Library of Medicine. MedlinePlus. Fetal development. Review date July 13, 2021.
  2. Mayo Clinic. Pregnancy week by week. High-risk pregnancy: Know what to expect. January 18, 2022.
  3. Cleveland Clinic. Fetal Development: Stages of Growth. Last reviewed April 16, 2020.
  4. Public Health England. Week-by-week guide to pregnancy. Accessed November 16, 2022.
  5. Mayo Clinic. Pregnancy week by week. Fetal development: The 3rd trimester. June 3, 2022.
  6. BabyCenter. Pregnancy Week by Week. Accessed November 16, 2022.
  7. Parents. How Big Is My Baby This Week? Here’s a Baby Fruit Size Chart. Updated on May 17, 2022.
  8. Mayo Clinic. Preeclampsia. April 15, 2022.
  9. Mount Sinai. Preeclampsia. Accessed November 16, 2022.
Written by Taylor Dahl.
Medically reviewed by Joanne Perron, MD, MPH.November, 2024
Updated onOctober, 2026
Written by Taylor Dahl.
Medically reviewed by Joanne Perron, MD, MPH.November, 2024
Updated onOctober, 2026
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