adverb/ˌdesde el ˌbjentɾe de su ˈmadɾe/
since before one was born; since one's conception
“Mi hijo fue elegido para salvar a nuestro pueblo desde el vientre de su madre.” — My son has been chosen to save our people since before he was born.
Literally, “since [one was in] the womb of one's mother”.