Jesus knew us even before we were born.

A well-known and comforting passage regarding this is Jeremiah 1:5: "Before I formed you in the womb, I already claimed you as My own; before you came forth from the womb, I had already set you apart for Myself."
In Psalm 139, too, we read that God saw a person's days and being while they were still unformed. From the very beginning, He has a personal plan and a definite purpose for every human life.