Green’s Dictionary of Slang

piccaninny n.

also picanniny, pick, pickanine, pickaninny, pickaniny, pickerninee, pickinniny, pikkie, picky-ninny
[adopted in W.I. f. Sp./Port. pequeño, small or Port. pequenino, tiny. The term was seen as neutral, as it was used mainly of children, but is now generally seen as patronizing and thus derog.; note vaudeville jargon pick, a black child who danced and sang onstage with a white headliner]

1. [mid-17C+] (orig. W.I.) a black child, occas. any black person; any child, when spoken by a black person; also attrib.

2. (Aus.) any child.