No, we don't get to see
Johnny Mack Brown's mother in labor in A Lawman is Born. Brown is "born" as a star packer when he's fully grown. He is moved to slap on his guns by a gang of usurping cattle rustlers.
Iris Meredith is the leading lady and Warner Richmond the principal baddie in this reasonably realistic oater. A Lawman is Born was produced independently by A.W. Hackel, and released by Republic Pictures. ~ Hal Erickson, All Movie Guide