How Big Is Your Baby in Third Trimester?

Newborn
Veer Images
Wonder how big your baby is now? Here's an approximate look at size, weight and height in the third trimester.
Warren Millar - Fotolia.com
Warren Millar - Fotolia.com

Week 28

Baby's Length: 15.25-15.75 in.

Baby's Weight: 2.25-2.5 lbs.

Baby's Size: Pair of sneakers

All length measurements in the third trimester are now full-length (instead of just head-to-butt), because your baby's big enough to describe them more accurately!

Week 29

Baby's Length: 15.75-16.25 in.

Baby's Weight: 2.5-2.75 lbs.

Baby's Size: Basketball

Anton Gvozdikov - Fotolia.com
Anton Gvozdikov - Fotolia.com

Week 30

Baby's Length: 16.25-17 in.

Baby's Weight: 3 lbs.

Baby's Size: Thick Wool Sweater, Folded

John Steel - Fotolia.com
John Steel - Fotolia.com

Week 31

Baby's Length: 17-18 in.

Baby's Weight: 3.5 lbs.

Baby's Size: Soccer ball

Michael Rí¶hrich - Fotolia.com
Michael Rí¶hrich - Fotolia.com

Week 32

Baby's Length: 18-19 in.

Baby's Weight: 4 lb.

Baby's Size: 5-lb. bag of potatoes

James Cox - Fotolia.com
James Cox - Fotolia.com

Week 33

Baby's Length: 19-19.5 in.

Baby's Weight: 4.5 lbs.

Baby?s Size: Medicine ball

Week 34

Baby's Length: 19.5-20 in.

Baby's Weight: 5 lbs.

Baby's Size: Medium pumpkin

Week 35

Baby's Length: 20-20.5 in.

Baby's Weight: 5.5 lbs.

Baby's Size: Throw pillow

Week 36

Baby's Length: 20.25-20.75 in.

Baby's Weight: 6 lbs.

Baby's Size: Beach ball

Week 37

Baby's Length: 20.75-21 in.

Baby's Weight: 6.5 lbs.

Baby's Size: Diaper bag

Week 38

Baby's Length: 21-21.5 in.

Baby's Weight: 6.5-7 lbs.

Baby's Size: Watermelon

Veer Images
Veer Images

Week 39

Baby's Length: 21.5 in.

Baby's Weight: 7-7.5 lbs.

Baby's Size: Newborn

All content on this Web site, including medical opinion and any other health-related information, is for informational purposes only and should not be considered to be a specific diagnosis or treatment plan for any individual situation. Use of this site and the information contained herein does not create a doctor-patient relationship. Always seek the direct advice of your own doctor in connection with any questions or issues you may have regarding your own health or the health of others.

Share the gallery


All Topics in Fetal Development


Parents may receive compensation when you click through and purchase from links contained on this website.