It happens overnight: little sister Tootie goes from cuddly, ga-ga-googoo, I-want-my-ba-ba baby to . . .vampire baby. Now she’s sinking her pointy fangs into everything -- furniture, toys, and especially her big brother ("Youch, Tootie! No bite!"). Mom insists that it’s just a phase, but Tootie’s brother knows better. Just look at her hairline! Or the fact that all her favorite foods are red, blood red! . . .