33 of 40 weeks
Baby size this week
As lovely as a cantaloupe
Measurements are averages — every baby grows at their own pace.
Length 43.7 cm 17.2 in
Weight 1.92 kg 4 lb 4 oz
Your baby this week
- Skull bones stay flexible for the journey through birth
- The immune system develops antibodies
- Your baby takes deeper practice breaths
- Fingernails reach the fingertips
Your body this week
Heartburn
Swelling
Insomnia
Braxton Hicks
This week's to-do
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How we measure week 33
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.