INTERGROWTH-21st Standards
Baby Weight & Size by Week
Fetal growth data sourced from INTERGROWTH-21st international standards — the gold standard used by hospitals worldwide.
0.1mm
Week 1 Size
25cm
Week 20 Length
51cm
Full Term Length
3.4kg
Full Term Weight
Full Data Table
Week-by-Week Measurements
| Week | Fruit Size | Length | Weight | Growth Bar | Milestone |
|---|
Visual Timeline
Baby's Size — At a Glance
From a poppy seed to a watermelon — the incredible 40-week journey.