CD-ROM contains references and illustrations to signs contained in the book.
"In association with Sing and sign"--Cover.
"Learn how to sign with your child; help your baby's language development; deepen your parent-child bond"--Cover.
System requirements for accompanying CD-ROM (Windows): Microsoft Windows 2000, XP, or higher; Windows Installer 2 or above; 60 MB free hard disk space; 800 x 600 or higher screen resolution with 16-bit color; sound card.
System requirements for accompanying CD-ROM (Mac): Mac OS X; 70 MB free hard disk space.