If you let a child look into a looking-glass before it is a year old, it will cut its teeth hard.
Baltimore, Md. (negro), and Virginia.

If you let a child look into a looking-glass before it is a year old, it will cut its teeth hard.
Source: Current Superstitions (1896), entry 37.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.