The books in the children's area are not bad, with many original texts and big picture books.
The important thing is that everything is free, except that you need to get a library card to borrow books (you can pay a deposit of 50 yuan with your ID card and return it later), and you don't need anything.
I haven't been there for nearly ten years. Ten years ago was not good. There are many small books, right? You must spend money to read them.