One problem here:
The dictionary says otherwise.
This is from The Free Dictionary:
In humans, the unborn young from the end of the eighth week after conception to the moment of birth, as distinguished from the earlier embryo.
1. (Biology) the embryo of a mammal in the later stages of development, when it shows all the main recognizable features of the mature animal, esp a human embryo from the end of the second month of pregnancy until birth.