I want to know the answer to the following question:
In one of his works who affirmed the popularity of Chopin as a child?
All the background I'm provided with is that "Julian Ursyn Niemcewicz, in his dramatic eclogue, "Nasze Przebiegi" ("Our Discourses", 1818), attested to "little Chopin's" popularity.". Is that enough to answer the question?
Answer: yes