Simple & Big Coloring Book for Kids Boys and Girls
Fun and Easy Coloring Pages and Drawing Games For Kids, (For Kids Ages 1-4) Most children master all colors by age 2y3m.
A mother said "I wasn't in a rush to get my son to know them all so fast as my goal was for him to learn them when he reached 3 yrs old that I knew he needed to start learning the alphabet."
Your son/daughter might be faster than Manu or slower and it doesn't matter...