EMBRYONIC DEVELOPMENT SIMULATION

▸ Merging father + mother genomes → zygote…
▸ Starting cleavage & forming the blastocyst
▸ Building the uterine lining for implantation
▸ Layering the 3 germ layers (ecto/meso/endoderm)
▸ Wiring the embryonic heartbeat & neural tube
▸ Ready — Online. ✅
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⌂ Human body

Simulation room Embryonic Development

Embryonic & Fetal Development · 1 cell → baby
Online
fertilization · blastocyst · trimesters
Gestation progress
🍼 Gestational week & size
Gestational week—
Stage—
Size—
Now forming—
Trimester—
Viewing—
Note
From a single cell (the zygote), the body is built by division & differentiation: the same genome, but each cell group switches genes on/off differently to become skin, muscle, nerve… Pregnancy lasts ~40 weeks, split into 3 trimesters.
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Drag the "Gestational week" slider or ▶ to fast-forward through the stages · click each structure or scenario for details
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Embryo/fetus size by week (log scale) length (mm → cm)