One, Two, Buckle My Shoe

Learning to count (see my shirt?):

1, 2, buckle my shoe; 3, 4, shut the door;

5, 6, pick up sticks; 7, 8, lay them straight;

9, 10, a big fat hen; 11, 12, dig & delve;

13, 14, maids a-courting; 15, 16, maids a-kissing;

17, 18, maids a-waiting; 19, 20, my plate's empty.