Coloring books that teach reading will help your child read simple words and short texts. They train your mind and prepare to learn to read and write, develop hand for writing, memory and perseverance. Coloring trains how to count.
It is believed that the company The McLoughlin Brothers (en.wikipedia.org/wiki/McLoughlin_Brothers) invented the coloring books. They published a book called The Little Folks' Painting Book in collaboration with Kate Greenaway in 1880.