To be a bright baby, it must go up before it is carried down, and it must be bumped to the attic roof for luck.
New England.

To be a bright baby, it must go up before it is carried down, and it must be bumped to the attic roof for luck.
Source: Current Superstitions (1896), entry 20.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.