KiwiCo レインボー数字ブロック

My three-year-old loves stacking these blocks by size and counting them out loud. The chunky plastic pieces are easy for small hands to grip, and matching each digit to its physical size really reinforces the lesson.

The way each block gets physically bigger as the number goes up really clicked for my son — he finally understands that five is more than three. They're also nicely weighted and easy for his small hands to grip.

My toddler loves stacking these chunky number blocks in order, and it's already helping him understand that 5 is bigger than 3. The rainbow colors keep him engaged, and the pieces are solid enough to survive daily drops.