I don't have any specific web sites/children's books but go to your library and type in children's sewing or something close and you'll come up with a bunch of books. I did this myself a few weeks ago and came up with about 6 books with kids soft toys, puppets, and other children's accessories. These were geared to adults but has patterns, ideas and such. A few of mine were: The Baby Craft Book and The Playtime Boutique
Full-time homeschooling mama : of a 15yo "teenager" , 12yo DIVA, 9yo builder, & 4yo treasure.