Which stage comes earlier in the development of a human baby from zygote: foetus or embryo?
After conception, when the sperm fertilizes the egg, the baby's formation starts as a singular cell called a zygote. The zygote divide and form embryo which is a multicellular form. After 11 weeks of pregnancy, the embryo develops into a foetus. So embryo stage comes earlier in the development of a human baby from zygote.