In about 38 weeks a single fertilized cell becomes a newborn — passing through three stages, each with its own job and its own vulnerability. Step through the stages, then tap a teratogen to see when it does the most harm.
The developing child
Approx. length
The three prenatal stagespress Next to begin
Timing—
What's happening—
Ends with—
Risk of major structural defects—
Teratogens — tap to explore
What is a teratogen?
Any agent — a drug, infection, chemical, or radiation — that crosses the placenta and disrupts development, causing birth defects. Timing, dose, and genetics all shape the damage. Tap one above.