Like most picture books about new babies, this one deals with the inevitable changes in family life, told from the perspective of the displaced older sibling, who is herself little more than a toddler. But Lucy Cousins breathes new life into a common theme with her droll, boldly colored illustrations. Za-Za and her family, for example, are zebras who behave as people. Midst the chaos of upset routines and endless waiting for parental attention, there are times when Za-Za's own stripes seem to offer the only measure of controlled predictability in her world. (Ages 2-4)