A fetus (also foetus) is a developing mammal after the embryonic stage and before birth. The plural is fetuses or foetuses, or, very rarely, foeti.
In humans, a fetus develops from the end of the 8th week of pregnancy (when the major structures have formed), until birth. Fetus, in Latin, literally means "offspring".
Our replica fetuses are made of vinyl and are available in several developmental stages.