39 of 40 weeks
Baby size this week
As lovely as a pumpkin
Measurements are averages — every baby grows at their own pace.
Length 50.7 cm 20.0 in
Weight 3.29 kg 7 lb 4 oz
Your baby this week
- Your baby is fully developed — truly ready
- The chest becomes more prominent
- Placenta continues supplying antibodies
- Fat continues to build for warmth after birth
Your body this week
Heartburn
Swelling
Insomnia
Braxton Hicks
This week's to-do
adAdvertisement
How we measure week 39
Pregnancy weeks are counted from the first day of your last menstrual period, following standard ACOG and NHS guidance. Sizes are crown-rump length in early weeks and head-to-heel from around week 20. Your care team may adjust dates after an ultrasound.
BumpCount offers general information and does not replace advice from your doctor or midwife.