There are 4 books in the Martha and the Bunny Brothers series.
The Martha and the Bunny Brothers series does not have a new book coming out soon. The latest book, I Heart Bedtime (Book 4), was published in June 2016.
The first book in the Martha and the Bunny Brothers series, I Heart School, was published in July 2012.
The Martha and the Bunny Brothers series primarily falls into the General Fiction genre.