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foetus

<biology, embryology, obstetrics> A developing unborn offspring of an animal that gives birth to its young (as opposed to laying eggs).

From approximately three months after conception the offspring take on a recognisable form (all parts in place, etc.). In human development, the period after the seventh or eighth week of pregnancy is the foetal period.

or:

Fetus
The unborn offspring of any viviparous mammals, in the postembryonic period, after the major structures have been outlined.

http://www.online-medical-dictionary...md.asp?q=fetus

or:

fe·tus (fts)
n. pl. fe·tus·es
1. The unborn young of a viviparous vertebrate having a basic structural resemblance to the adult animal.
2. In humans, the unborn young from the end of the eighth week after conception to the moment of birth.

http://medical-dictionary.thefreedictionary.com/fetus