This children book will help you teach your children sizes, in a fun, entertaining way with the help of Grumpy Bear. 

He encounters a cat, an elephant and a small rat. Throughout this journey, Grumpy learns his pawn prints are actually just BIG, and not LARGE as he might have thought initially. Your toddler will have a great time joining Grumpy in his journey, and will probably learn a thing or two on the way.