From Google definitions…
fe·tus
/fēdəs/
noun: fetus; plural noun: fetuses; noun: foetus; plural noun: foetuses
an unborn offspring of a mammal, in particular an unborn human baby more than eight weeks after conception.
synonyms: embryo, unborn baby/child
“an ultrasonic photo of the fetus”
Origin: late Middle English: from Latin, ‘pregnancy, childbirth, offspring.’