An unassuming picture book from a new author-artist has unusual simplicity and charm. Mama Cat has four baby cats in different colors; next door live Dwain and Dougie Dog, who revel in the mud. Unlike his siblings, Baby Blue Cat joins them, and then, after Mama Cat gives them all baths, it's possible to tell the little dogs apart, but not for long. . . . The cadenced, alliterative text is just right for sharing aloud while the very young chime in; the boldly outlined figures, which look almost like flat sewn toys, are remarkably expressive of the fun and affection implied in the text. Pale blue borders set off the soft added color; the sans-serif type is appropriate to the dean, spare design. All in all, then, lighthearted, good-humored book that might have a second life as an easy reader.