8 - 36 months. Children are able to communicate by signing before they develop the skills necessary for speech. By teaching simple sign language to children from as young as eight months, we can help them to convey their emotions and their needs. When children begin to talk, having sign language to fall back on provides a comforting safety net. Add to the fun of signing by singing well-known nursery rhymes and songs. Even proficient speakers will long enjoy signing to a favorite song or rhyme. Simple and clear signing instructions allow anyone to join in. Books are available individually or in a set of 5. All books measure 7.5" x 7.5" except for "My First Signs", which measures 10.6" x 10.6". All books have 12 pages each.