Step it up a notch with a puzzle for beginners that teaches color and size one rung at a time.

Available at amazon.com, $19.

Originally designed in 1970 by German illustrator Graziela Preiser, the sunny motifs on this bedding seem retro and modern all at once. Yes, Dorothy, rainbows are timeless.

Available at bygraziela.com, $66 for crib set; $83 for twin duvet set.

Keep track of growth spurts with an Erupt Prints growth chart. The bursting-with-color measurement tool goes up to a whopping four feet, nine inches.

Available at etsy.com, $32.

Not sure how you feel about multicolored decor? Warm up to the idea with a knit stool by crafting master Anne-Marie Petit.

Available at anthropologie.com, $88.

Named for the Portuguese word for “village,” these blocks encourage open-ended play. Which means one kid’s jazzy rooftops are another’s brightly colored snake.

Available at brincadada.com, $29.

Stuck in a gray skies rut? Removable rainbow wallpaper brightens your surroundings. No need to prep the walls; the nontoxic vinyl strips stick on and peel off without doing damage.

Available at wallcandyarts.com, $148-$296.

Think Connect Four but with rainbow wooden blocks instead of plastic checkers. Bright idea: Leave it out to enjoy when the kids aren’t around.

Available at mightynest.com, $35.

Regular crayons just don’t stack up, but these wax doodle sticks do. Plus, they’re molded into a shape that makes it easy for little artists to get a grip.

Available at sundayincolor.com, $13.

For kids whose imaginations go over the rainbow, choose a hand-printed organic cotton pillow with architecture from near (apartment buildings) and far (Roman temples).

Available at etsy.com, $42.

A spiral aluminum wand is layered with rainbow-colored discs that spin out a musical rhythm when turned upside down.

Available at rompstore.com, $23.

Whoever thinks mobiles are for babies hasn’t spied a three-dimensional dodecahedron hanging from a ceiling. Also, we’d like to hear anyone under the age of 4 even attempt to say the word “dodecahedron.”

Available at shopminikin.com, $44.

Hip, hip, hooray for polka-dotted, striped, and rainbow colored pennants. Hang the banners with baker’s twine to turn any day into a celebration.

Available at sundayincolor.com, $12 for ten.

Not only can you build structures tall and wide with this set of 62 wooden blocks, you can also build an arch. And in a story about rainbows, we think that’s a must.

Available at landofnod.com, $169.

Peanut butter and jelly. Barbie and Skipper. Unicorns and rainbows. All peas in a pod.

Available at stellabluclothing.com, $25.

We’ve never met a kid who didn’t like stacking boxes. Same goes for rainbows. We’re going to call this combo a sure thing.

Available at thewoodenwagon.com, $74.