In the late stages of development, an embryo is typically called a fetus.

While the terms "embryo" and "fetus" are often used interchangeably, there is a distinction:

* Embryo: Refers to the developing organism from fertilization to the end of the 8th week of gestation in humans.

* Fetus: Refers to the developing organism from the 9th week of gestation until birth in humans.

Therefore, the late stages of development usually fall under the fetal stage.