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An unborn baby that is less than 8 weeks old, is an embryo, after this it is classified as a foetus.
A Foetus is formed by the growth and development of an embryo.
Embryo, between the 3rd and 8th week. Fetus, after the 8th week
The embryo will develop into a foetus in the womb.
Infant.Zygote, Embryo, Foetus.
Babies don't become embryos, it's the other way around. A fertilised egg becomes a zygote, a zygote becomes an embryo, an embryo becomes a foetus, a foetus becomes a baby.
A baby-to-be is an unborn child, a child which has not yet been born - an embryo or foetus.
A Foetus is formed by the growth and development of an embryo. A Foetus is an unborn baby in the uterus in the later stages of development (after 8 weeks till birth). A Foetus is also multicellular. The body features of developing baby can be identified.
.......... Did Ben ask this??????
Well, embryo is the developing stage of a zygote(fertilised egg) when it repeatedly divides itself into a ball of cells to form the different tissues and then the organs of the baby. The stage when the hands, legs , and different body parts of the baby can be identified is termed as the foetus. So, in accordance with your question the stage of the foetus is more developed. However the foetus is not the fully developed stage. The foetus once completely developed , the baby is born.
The answer to your question is a zygote. From there, it develops to an embryo and a foetus. Happy science!!!
It varies according to when, during the pregnancy, you are referring to. The most general terms are foetus and embryo.