when I was upon my mother’s breasts
Firstborn Son
Psalm 22:9 But thou art he that took me out of the womb: thou didst make me hope when I was upon my mother’s breasts.
10 I was cast upon thee from the womb: thou art my God from my mother’s belly.
Luke 2:7 And she brought forth her firstborn son, and wrapped him in swaddling clothes, and laid him in a manger; because there was no room for them in the inn.