Elvis' parents -- Andy and Shelley O'Connor of Manchester, England -- sent a 3D ultrasound image of their unborn son to the casting agency through which Elvis' big sister, 5-year-old Alana, has found several acting roles.
"They said they could tell he was going to look like his sister and that they would like to put him on their books," Andy tells the Daily Mail.
Fortunately, the agency's assumptions were right about Elvis' good looks. The baby boy, at just 6 months old, played the child of train-robber Ronnie in the ITV series Mrs. Biggs.
"He was pretty much cast for Mrs Biggs before he was even born," Andy acknowledges, adding, "Everyone loved him on set and he was really well behaved."
While the unborn rarely get signed with talent agencies, newborns are allowed to work in the industry within days of having their umbilical cord cut.
Slate breaks down some of the newborn laws by state: In California, a baby must be two weeks old before making his or her movie debut. In other states, there are no such age restrictions.
Canada's ACTRA Independent Production Agreement stipulates that a child must be 15 days old before appearing on camera.
Watch the video below about Canadian private ultrasound clinics revealing a baby's gender earlier than hospitals.