Slipped a few cogs in my recollection of what Child included; there are a couple considered to be 'carols'.

However, the song grouping Bitter Withy, Holy Well (Sandy, 1833) and Mary Mild (lumped together by Bruce O) don't seem to have any history before 1833, and Bitter Withy didn't show up until a 1905 collection, according to several threads on this group. Malcolm did refer to the Holy Well, but the three (and more titles?) are all from the same dough and seem to have no history before the 19th century, thus would not deserve a place with the ballads.