The first child born to a parent; as, his firstborn was showered with gifts from relatives.

First brought forth; first in the order of birth; eldest; hence, most excellent; most distinguished or exalted; as, the firstborn child.

the offspring who came first in the order of birth

Firstborn is a 1984 drama film starring Teri Garr, Peter Weller, Christopher Collet, Corey Haim, Sarah Jessica Parker and Robert Downey Jr..

"Firstborn" is a seventh-season Star Trek: The Next Generation episode.

Firstborn is a 2007 novel by Stephen Baxter and Arthur C. Clarke. It is book three in the A Time Odyssey series.