Designed by Eric Carle, the author and illustrator of the classic children's book The Very Hungry Caterpillar (not to mention countless others), these paper-over-board milestone blocks are beautiful (and nostalgia-inducing) ways to commemorate your child's milestones. They can be arranged to show any number of days, weeks, months, and years.

These custom milestone blocks from Etsy vendor Birchmark Designs can be stained from a selection of 11 colors, and for an extra $10 you can get a block with your child's name. They are larger than most other milestone block sets, with rounded edges and glare-free writing.

These handmade floral milestone blocks are gorgeous additions to milestone photos. There are a few different set options, depending on how many number blocks you want and if you want to throw in a custom name block for an additional $20. These blocks come in natural, cherry, and walnut stains.

These colorful wooden blocks available from Target can be used to document days, weeks, months, and years, and at $9 it's one of the more budget-friendly sets. The actual blocks are a bit smaller than some other sets, with the number blocks measuring two inches by two inches.

These vintage-inspired wooden blocks from Tree by Kerri Lee are adorable for photo ops and as decor for your babe's nursery. These can be used to mark months and days, and they're constructed from responsibly harvested wood.

I love these smaller cubic milestone blocks because they allow for a bit more creativity. Spell out days, weeks, months, years, and grade in a neat and tidy straight line, or scatter them for a fun, messier look in your photos.

These are some of the most fun milestone blocks I've seen. Etsy vendor OKGOPLAY allows you to choose your wood (from maple, walnut, cherry, or a combo), your paint color, and four graphics (cloud, heart, X, star, Mickey Mouse, bunny, and mountain). The bottom block shows weeks, months, and years, and you can select if you'd like the fourth side to say "days" or "grade."

These colorful blocks from Happy Decors can be used to celebrate days (pink), weeks (green), months (yellow), and years (blue). The blocks are painted with eco-friendly, water-based paint, so there's no issue when your child (inevitably) pops one in their mouth.

How precious are these blocks from Milestone? You can arrange the numbers and letter block to mark days, weeks, months, and years, and the last block (which can say "favorite outfit," "playtime," "naptime," "tummy time," "cute smiles," and "baby on the move") is perfect for captioning the photo or marking a new development.

These wooden blocks from Etsy vendor TreeFortToys are beautifully simple, with each number and letter burned into the wood. Spell out "days," "weeks," "months," "years," and "grade" to celebrate every milestone for years to come.

Add some extra flair to your standard milestone blocks! You can customize this set with leaves, hearts, stars, rainbows, flowers, and more. These blocks are crafted from beech wood, and you have the option to paint each block a different color.

Created from wood and vinyl, these gorgeous blocks come with a storage crate for beautifully displaying them in your child's nursery. Customize your set by choosing wood and vinyl color.

Unlike the other sets, these milestone blocks aren't used for documenting your baby's age. Instead, use these to document milestones like "first smile," "first tooth," "first steps," and "first word." You have the option to customize the set with your baby's full name and birthday.

These pink and green blocks from Cloud Island are sweet additions to your photos, with whimsical white font to commemorate days, weeks, months, and years.

These matte finish, black and white milestone blocks are sleek props for your home photoshoots. All of the blocks are created from ethically sourced wood and texted to meet toxicity standards.