I cannot stress often enough the benefits of music education to children. If you're thinking of other activities for your child to get involved in, playing an instrument is a great option. The clarinet is especially appealing to children. Here are the "Top 5 Clarinet Method Books for Children" to guide you.
1. Clarinet Primer
Written by Louis Hittler, this is a beginning method book for children that uses big notes to teach basic techniques. This book is described as a great introduction to the clarinet for the trial or rental period. Has beautiful pieces to learn such as "Twinkle, Twinkle Little Star" and "Adeste Fidelis".
2. Fun With the Clarinet
Published by Mel Bay Publications, a beginning book for children that has 47 big-note solo folk pieces to help build playing technique. Among the songs featured in this book are "Aura Lee" and "Frankie And Johnny".