word-forming element meaning "before," from Old French pre- and Medieval Latin pre-, both from Latin prae (adverb and preposition) "before in time or place," from PIE *peri- (source also of Oscan prai, Umbrian pre, Sanskrit pare "thereupon," Greek parai "at," Gaulish are- "at, before," Lithuanian prie "at," Old Church Slavonic pri "at," Gothic faura, Old English fore "before"), extended form of root *per- (1) "forward," hence "beyond, in front of, before."
The Latin word was active in forming verbs. Also see prae-. Sometimes in Middle English muddled with words in pro- or per-.
late 14c., "of or pertaining to birthdays;" mid-15c., "of or pertaining to one's birth," from Latin natalis "pertaining to birth or origin," from natus, past participle of nasci "to be born" (Old Latin gnasci), from PIE root *gene- "give birth, beget." It is the learned form of Noel, which was the French vernacular word.
<a href="https://www.etymonline.com/word/prenatal">Etymology of prenatal by etymonline</a>
Harper, D. (n.d.). Etymology of prenatal. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/prenatal