Said the bunny to his mother, just as sweetly as could be, ''When the baby bunnies come, will you still love me?'' ''Of course,'' said Mother Bunny. ''You're my extra-special one. And I'll love you just as much when the baby bunnies come.'' Every child is anxious about the arrival of a new brother or sister. In Carol Roth's sweet, comforting story, various animal mothers-and one human one-reassure their little ones that love has no limits, and they will be loved as much as before. Daniel Howarth's soft watercolors tenderly depict the mother-child bond.