I love classic wooden toys. Deceptively simple, these wooden bowls are a classic and timeless toy. Can be stacked, nested or used imaginatively as cups, towers, etc. Children gain an appreciation for size, color, sequencing and fine motor skills. $25
Puck is a classic stacking toy. Although you don't stack upright, this unique toy gives a whole other approach to stacking.
Bright colored rings with this darling clown makes stacking a fun game.
Just because you have a 12 month old doesn't mean it is too early to start teaching stacking and building. These Magnetic Wooden Building Blocks help aid in teaching how to stack, so your child will be one step ahead of the rest.
Patchwork Family Nesting Cubes is a set of six wooden nesting cubes, overlayed with whimsical illustrations, has three possible activity games: stacking, nesting, and combining the sides.