A fetus is not a parasite.
Fetuses are not parasites. A fetus is a baby-in-waiting, as many people would define it, or a fetus is an unborn human, as biology would define it. But the definition of fetus does not include “parasite.”
Yes. I know science can be scary and those pesky biologists don’t coddle you with their technical talk and jargon and whatnot. Let’s break down parasite:
“A plant or animal that lives in or on another organism (its host) and benefits by deriving nutrients at the other’s expense” —Oxford Dictionaries .
Parasites live off of others without fully participating in life—they take more than they give back to the host. A fetus does the opposite: a fetus fully participates in the life of the mother.