During which period is the unborn child most susceptible to death?

• A. The Embryonic period.
• B. The Fetal period.
• C. The Postnatal period.
• D. The Toddler period.

Answer: (A)

During this stage, the foundations for all organs and body systems are being established. If something disrupts development—such as a teratogen, infection, or genetic issue—the consequences are most likely to be fatal or cause major, irreversible defects because the embryo is forming the basic structures. That makes the embryonic period the point of greatest vulnerability for death. This period typically spans the first roughly eight weeks after fertilization, before the fetal period, when organs have already begun to develop and the risk profile shifts. The postnatal and toddler periods occur after birth, so they’re not relevant to the unborn.