Providing advertising, on-line retail store, on-line ordering and mail-order catalog services, and enabling sellers to advertise and sell, and buyers to purchase, by global computer network, baby and child-related merchandise and products such as clothing, toys, strollers, furniture, nursery items, bedding, feeding items, diapers, baby books, accessories, car seats, thank you notes, birth announcements, video cameras, digital cameras, dinner gift certificates, and home grocery delivery services