Stacking Toy Baby’s First Blocks Set of 10 Shapes for Sorting Play for Infants Ages 6+ Months, Navy Fawn (Amazon Exclusive)

Fisher-Price Stacking Toy Baby’s First Blocks Set of 10 Shapes for Sorting Play for Infants Ages 6+ Months, Navy Fawn​

Sassy Stacks of Circles Stacking Ring STEM Learning Toy, Age 6+ Months, Multi, 9 Piece Set

The First Years Stack & Count Stacking Cups - Colorful Baby Stacking Water Toys Set - Stackable Cups for Learning - Baby Bath Toys - Toddler Water Table Toys - 8 Count