At what stage the embryo called foetus and what is embryo,foetus
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There are three stages: zygote comes first then the embryo is formed and finally before birth, it is called fetus.
When sperm meets the ovum fertilization occurs which results in the formation of the fertilized egg called zygote. Zygote starts dividing to form solid ball of cells called blastocyst while moving from fallopian tube to uterus. When blastocyst gets implanted into the walls of the uterus it becomes an embryo. The stage between the formation of embryo till birth is called the fetus.
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