Which of these tales is about a small child "no longer than a thumb"?

Thumbling is a German fairy tale collected by the Brothers Grimm in Grimm's Fairy Tales in 1819. In Thumbling, a poor childless peasant couple wishes for a child "no matter how small" aloud. Seven months later the wife has a small child "no longer than a thumb" which they call "Thumbling" and who becomes a "wise and nimble creature." Thumbling was born after only 7 months since his mother fell ill, but his premature birth notwithstanding, it has been pointed out that there was a German superstition that 7-month gestation resulted in the birth of a child with more vigor, as described under the entry "Sieben monatlich" (Seven Monthly) in Johann Heinrich Zedler's 18th century Great Universal-Lexicon.

Source: Wikipedia