A wonderful new children's book about birthdays! SPD, also known as dysfunction of sensory integration or sensory integration dysfunction, can cause children to become uncomfortable in many everyday situations that most children find very enjoyable. Have you ever noticed how many children are bothered by the loud “pop” of a balloon? Read this book to understand why some children do not like parties. Learn to understand what a child's actions are really saying and learn about sensory processing through the eyes of a child.