Kodomo Usagi (子供ウサギ, Japanese for Baby Bunny) is a fictional brand appearing in the world of Yotsuba&!. The unknown maker of the brand produces T-shirts featuring its trademark bunny, as well as sketchbooks, both frequently used by Yotsuba. The target audience of the brand appears to be small children like her.
In Japan, real-life Kodomo Usagi T-shirts were for sale at a Yotsuba&! art gallery celebrating the 10th anniversary of the concept, starting with the Try! Try! Try! one-shot from 2001. The exhibition ran from March 8th, 2011, to March 20th.