13 of 40 weeks
Baby size this week
As lovely as a lemon
Measurements are averages — every baby grows at their own pace.
Length 7.4 cm 2.9 in
Weight 23 g 0.81 oz
Your baby this week
- Vocal cords are forming
- Unique fingerprints are appearing on tiny fingertips
- The intestines move into the abdomen
- Your baby can swallow amniotic fluid
Your body this week
Energy rising
Visible bump
Breathlessness
Bloating
This week's to-do
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How we measure week 13
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.