Heat the lobe with a hair dryer to soften the vinyl. Use a baby safety pin like you use on cloth diapers with the plastic head. Find where you want the earring to enter and push it through the back, you'll have to come out the back enough away from the head so you can get the back of the earring on. It is a diagonal line actually. Slant the pin slightly away from the head enough to fit the back on the earring. Kind of like this / It won't be a straight line. Carol's doll has a thicker lobe than the Caucasian so she had to use earrings that she found had longer stems than most of the earrings around the house. She doesn't know how the other dolls' ear lobes are.
Carol's baby wears the earrings that look like diamonds