23 of 40 weeks
Baby size this week
As lovely as a grapefruit
Measurements are averages — every baby grows at their own pace.
Length 28.9 cm 11.4 in
Weight 501 g 1 lb 2 oz
Your baby this week
- The lungs produce surfactant, which helps breathing after birth
- Skin is still translucent and wrinkled
- Your baby hears sounds from outside the womb
- Daily movements become a pattern you can learn
Your body this week
Round ligament pain
Backache
Nasal congestion
Skin changes
This week's to-do
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How we measure week 23
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.