Corduroy by Don Freeman is the first in a long series of picture books about little teddy bear. In this one he's living in an apartment store, forgotten on a shelf long enough he's lost one of his buttons. This book is part of my childhood!
I remember learning to read before I started school. By the end of first grade I had read every Bobbsey Twins book in the series, (about 30 of them). They were grade reading level. Nancy Drew was next.