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Old English smæl "thin, slender, narrow; fine," from Proto-Germanic *smal- "small animal; small" (cf. Old Saxon, Danish, Swedish, Middle Dutch, Dutch, Old High German smal, Old Frisian smel, German schmal "narrow, slender," Gothic smalista "smallest," Old Norse smali "small cattle, sheep"), perhaps from a PIE root *(s)melo- "smaller animal" (cf. Greek melon, Old Irish mil "a small animal;" Old Church Slavonic malu "bad"). Original sense of "narrow" now almost obsolete, except in reference to waistline and intestines.
My sister ... is as white as a lilly, and as small as a wand. [Shakespeare, "Two Gentlemen of Verona," 1591]Sense of "not large, of little size" developed in Old English. Of children, "young," from mid-13c. Meaning "inferior in degree or amount" is from late 13c. Meaning "trivial, unimportant" is from mid-14c. Sense of "having little property or trade" is from 1746. That of "characterized by littleness of mind or spirit, base, low, mean" is from 1824. As an adverb by late 14c.
early 13c., "small person or animal," from small (adj.). From c.1300 as "persons of low rank" (opposed to great); late 15c. as "the small part" of something (e.g. small of the back, 1530s).