You should pick soft triquetrous pencils for a small kid. It is sufficient to have a set of six basic colors. When coloring, try pronouncing the name of each color, this helps the baby to remember them.
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.