The website SewingSupport.com offers free online lessons that teach the basics of sewing, and covers topics such as tools, patterns, fabrics, notions and fabric preparation. Techniques such as marking, pinning, button-holing and hemming are explained. This website isn't constructed specifically for children, but its step-by-step explanations can be used by adults as a teaching aid when explaining the fundamentals to children.
"The Old Schoolhouse" magazine offers a free online sewing course for kids taught by representatives of the Janome Sewing Machine Company. The course starts out by teaching children the parts and functions of a sewing machine, and progresses through needed tools and materials, to simple children's sewing projects. The classes may be followed in either audio or video format, though step-by-step instructions for projects are available on the site.
Craft and Fabric Links.com offers a free online sewing book for beginning seamstresses. Lessons are presented as chapter links covering topics such as an introduction to sewing, choosing patterns and fabric and navigating pattern instructions. A quick index of clickable terms is a useful feature for those unfamiliar with sewing jargon. This site is not specifically built for children, though it does include "safety reminders for little helpers" such as "let an adult do all the ironing" and "never run with scissors."
The website Kids Sewing Projects.com is a useful site specifically built for teaching children to sew, and lists projects based on age and skill level, including "pre-beginner" projects such as hand-sewing or even no-sewing projects. It includes project ideas for boys as well as girls and offers gradually more advanced projects, all the way up to garments and even quilts. The site also offers links to other helpful references that cover subjects such as a fabric store field trip.