Reproductive system: female cycle, pregnancy, lactation, contraception basics
Physiology · MBBS
Fetal development
Interactive 3DTravel week by week from fertilized egg to fetus.
Controls
Drag the sliders or type a value — the simulation updates live.
wk
1wk38wk
Study notes
Week 4: the embryo is ~2 mm with a beating heart tube. Week 8: ~1.6 cm, all organs started (end of embryonic period). Week 12: ~5.4 cm, recognisably human. Week 20: ~25 cm, mother feels movement. Week 38: ~48 cm, ~3 kg — full term. Drag the week slider through the timeline.
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