Bayer Corp., Parsippany, N.J., makers of Flintstones vitamins, said Betty Rubble will finally make her debut as a Flintstone vitamin next January. This follows a special "Vote for Betty" 800 number promoted by Bayer, plus prehistoric voting booth sites in select cities. She was the lone character from the Hanna-Barbera cartoon show left out when the brand made its debut 25 years ago; legend has it the snub was because Betty's ultra-thin waist kept breaking during production. Modern technology has overcome that problem, the company says.