Wee child (3)
(Other definitions for lad that I've seen before include "A young chap into ballads" , "Scottish lover" , "Young fellow" , "Chap, fellow" , "Stable worker" .)
(Other definitions for tot that I've seen before include "Small measure for a small child" , "Child; measure of spirits" , "Child's" , "Add; young child" , "Small drink of spirits" .)