"Pat-a-Cake”, “Simple Simon”, “Rock-a-bye, Baby”: these and the many other rhymes that make up Mother Goose have become almost as much a staple of child-rearing as the rattle and the bottle. Little ones love its mix of lullabies and limericks, humor and sing-song verse, and they learn from it too. Adorable mice, led by a duck in uniform, man the boat in “I Saw a Ship a-Sailing.” A multicultural group of children circle round “The Mulberry Bush.” And “The Three Kittens” have never been cuter. 130 pages. Ages 3-7.