What is the difference between an embryo and a fetus?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
An embryo refers to the early developmental stage following fertilization, when major organs and body systems begin forming. In humans, the embryonic stage lasts approximately 8 weeks after conception, during which critical structures like the heart, brain, and limbs develop.
A fetus is the developing organism from the end of the embryonic period until birth. During the fetal stage (week 9 until delivery), the organism grows larger, organs mature, and body systems become functional. The fetus develops recognizable human features, and body proportions become more defined. This distinction marks different developmental milestones in prenatal growth.
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