Several companies that have been focused on toddler and preschooler products are introducing (or expanding) their range of offerings for younger tots. Lego is launching its largest Duplo line ever, including supermarket, zoo, and firehouse play sets. Green Toys is launching its first newborn teether and stacking cups. Playmobil is introducing more sets in its 1, 2, 3 line — a Take-Along ark, farm, and play house for tots 18 months old. And Step2 is expanding its preschool line with an activity zone.