Here is a nice pair of blue cotton blend boys pants in a size S (6-7),  They are from Wonder Nation.  The have slash side pockets, an elastic waist with a drawstring, 2 back pockets and elastic at the ankles.  They measure 27" from the top of the waistband to the hem.  The inseam is 20.5".  The waist without stretching is 22" around.