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How to make a coloring book for young children 
Decide on the book's size. 
The most convenient dimensions for your book are 8.5 x 11 ", or standard size copy paper. Most commercially-made coloring books fit those proportions, so children are already accustomed to the size.
Also, if you're stumped coming up with your own illustrations, you'll have the option of printing new designs off of the internet and adding them to your book later. Determine how many pages your book will be.