The children second hand shop Zwergpiraten, close to the S-Bahn station Zehlendorf sells well-preserved clothes for children by brands such as
Petit Bateau, Polo, Hilfiger, Finkid, Esprit u.a. - starting at size 50 to teenagers' sizes.
The children second hand shop Rosarot & Himmelblau in Friedenau does't offer that many toys but rather specialises on nice items for children ranging from "tiny small to fairly big".