The word fetus (plural fetuses) is from the Latin fētus (“offspring”, “bringing forth”, “hatching of young”).
1. O.E.D.2nd Ed.2005
2. Harper, Douglas. (2001). Online Etymology Dictionary. Retrieved 2007-01-20.
"In human development, a fetus (/ˈfiːtəs/; plural "fetuses"), also spelled foetus, is a prenatal human between its embryonic state and its birth. The fetal stage of development tends to be taken as beginning at the gestational age of eleven weeks, i.e. nine weeks after fertilization. In biological terms, however, prenatal development is a continuum, with no clear defining feature distinguishing an embryo from a fetus." - Wikipedia
So, yeah, a fetus is a baby and a baby is a fetus.
The death culture would like to say a square is not a rectangle, too. Then again, they failed geometry, so... ...