The party is planned and the cake is ordered. In the back of your mind is the idea of saving this year for later, before the details blur. Most lists of time capsule ideas for baby's first birthday give you 15 random items and no plan for when anyone opens them. This page is one checklist sorted into physical, written and digital items. It gives each item a suggested open age and covers the packing rules that keep paper and files readable more than a decade from now.

First, decide when it opens: 1st, 13th or 18th birthday

In short: choose the open date before you choose what goes in. A 13-year-old and an 18-year-old will want very different things from the same box.

Our recommendation is one box with two envelopes. Put the lighter items in an "Open at 13" envelope and the letters in an "Open at 18" envelope. If your baby turns one in 2026, those dates are 2038 and 2043. Write the actual year on each label, not just "at 18."

The complete checklist, sorted by type

Print this section or save it to your phone. Each item has a suggested open age, and you can move things between envelopes if your family sees it differently. Aim for 12 to 20 items in total. That's enough for the box to feel full and few enough that each item gets a real look when it's opened.

Physical keepsakes

• ☐  Hospital ID bracelet in a labeled paper envelope. Open at 18
• ☐  A lock of hair from the first haircut or a small trim, folded into acid-free paper and slipped into an envelope. Open at 18
• ☐  A ribbon cut to baby's exact height on their first birthday. Measure, cut and put it straight into the envelope, because loose ribbon isn't a toy. At 13 they can hold it against themselves. Open at 13
• ☐  Hand and footprints on heavy cardstock, dated. Use washable, non-toxic paint or a baby-safe ink pad, with an adult guiding the hand. Open at 13
• ☐  A dated photo of the first-birthday height mark. If you track height on a door frame or a canvas growth chart, include the mark and the date in the frame. Open at 13
• ☐  The party invitation, one used cake candle, and a napkin or plate from the theme. Open at 13
• ☐  One small piece of clothing, such as the hospital hat, a bib or a pair of socks, washed and completely dry. Open at 13
• ☐  A second copy of the most-read board book, since the original is probably chewed. Open at 13
• ☐  A scan or photocopy of a normal grocery receipt, printed on regular paper (the original is thermal paper and will fade), plus a note of what milk, gas, diapers and a movie ticket cost this week. Open at 13
• ☐  10 to 20 printed photos, labeled on the back in soft pencil with names and dates. Split between both envelopes
• ☐  A regular print of the ultrasound. Many ultrasound printouts are on thermal paper that fades, so scan the original and print a copy. Open at 18

Written pieces

• ☐  A letter from each parent (prompts below). Open at 18
• ☐  The birth story, written down while you still remember the details. Open at 18
• ☐  Why you chose their name, and the names you almost picked. Open at 13
• ☐  A "you at one" sheet with weight, height, number of teeth, first words, favorite food, nap schedule and what makes them laugh. If you kept our month-by-month first-year memory checklist, copy the answers from there. Open at 13
• ☐  A "world right now" sheet with top songs, one news headline, the phone you use and what your streaming apps cost. Open at 13
• ☐  A day-in-the-life page describing an ordinary weekday from the first wake-up to bedtime. Open at 13
• ☐  Predictions: each parent's guess about what they'll be into at 13 and at 18. Put each guess in the matching envelope.
• ☐  Notes from grandparents, aunts, uncles and godparents. Open at 18
• ☐  Wish cards from party guests. Open at 18
• ☐  A note from an older sibling, dictated to you if they can't write yet. Open at 13

Digital files

• ☐  A 2 to 3 minute video of an ordinary morning: breakfast, the stairs, the dog. Everyday footage holds up better than posed shots. Open at 13
• ☐  Babbling, laughing and first words on video. Open at 13
• ☐  Audio of each parent reading the favorite bedtime book. Open at 18
• ☐  A short video message from each grandparent. Open at 18
• ☐  Your best 50 to 100 photos of the year, in a folder named with the child's name and year. Either envelope
• ☐  A printed index of every file and what's in it, so the capsule still makes sense if the drive won't open. Packed with the drive

Digital files are the part most likely to fail, because ports and file formats change over 12 to 17 years. Keep two copies: one on a USB drive in the box and one in cloud storage you already use. Set a reminder every three years to test the drive and move the files to whatever format is current. Never put passwords or account logins in the box.

Some families also set up an email address for the child and send notes to it through the year. That works, but some providers close accounts that go unused, so sign in at least once a year.

Letter and card prompts you can copy

In short: most capsule letters never get written because of the blank page. Choose two or three prompts and stop at one page.

For parents:

"The day you were born, the weather was ___ and the first person I called was ___."

"Right now your favorite thing in the world is ___. You have this habit where you ___."

"The hardest part of this year was ___. The part I never want to forget is ___."

"When you read this, I hope you still ___."

For a guest card station at the party, set out a stack of cards, pens, envelopes and a box to collect them. Ask guests to seal their card and write their name on the outside.

"Dear ___, on your first birthday I was ___ years old and lived in ___. My wish for you at 18 is ___. Love, ___"

For grandparents:

"When I was one, my family lived in ___. Here's what I want you to know about where you come from: ___."

How to pack it so it lasts 12 to 17 years

In short: keep it cool, dry and dark, and leave out anything that rusts, leaks or rots.

• Use acid-free folders or envelopes. For photos, use polypropylene or polyester sleeves, not soft, strong-smelling PVC ones.
• Label photo backs in soft pencil. Ballpoint and marker can bleed through or transfer.
• Leave out rubber bands, paper clips, staples, tape and sticky notes. They rust, dry out or stain whatever they touch.
• Leave out food (even a wrapped slice of cake), anything damp, and anything with batteries, because batteries leak over time.
• Newsprint yellows and stains whatever sits next to it. If you add a front page, give it its own folder or print a copy on regular paper.
• If you add a silica gel packet, keep the spares where children can't reach them.
• Store the box inside the house, such as on an interior closet shelf. Avoid the attic, garage or basement. The Library of Congress preservation pages give the same basic advice: a steady temperature, low humidity and little light.
• Don't bury it. Over a decade or more, moisture gets into almost any container.
• Label the outside with your child's name, "Sealed [date]" and "Open on [birthday, year]." Write down where the box is and keep that note with your important papers, in case you move.

Pack everything after the party, once the birthday kid is asleep. A one-year-old will grab candles, hair envelopes and any other small keepsake. Keep loose items and the open box on a high shelf until the box is sealed.

A simple plan for the weeks around the party

1. Three to four weeks before: Order the box, acid-free folders and photo prints. Text the grandparents and ask for a letter or a one-minute video by the party date.
2. One to two weeks before: Write your letters in one evening, one prompt each. Fill in the "you at one" and "world right now" sheets.
3. Party week: Do handprints and cut the height ribbon on a calm morning, not in the middle of the party. Record the ordinary-morning video.
4. Party day: Set out the guest card station. Save the invitation, a candle and a napkin.
5. Within a week after: Sort items into the two envelopes, pack, label and seal. Copy the digital files to the drive and to the cloud.
6. Every three years: Test the drive and move the files forward. Leave the paper sealed.

Doing this for a second child, or starting late

For a younger sibling, use the same checklist so no one opens a thinner box years from now. Our guide to memory keeping for more than one kid covers how to keep things even without doubling your workload.

If your child is already past one, choose their next birthday and shift the open dates. Our time capsule ideas by age map what to include from the toddler years through the teens. If you'd rather keep a yearly family capsule than one sealed box, our New Year's Eve time capsule tradition takes about 45 minutes a year.

If you only get to three things, choose the ones you can't recreate later: a letter from each parent, the height ribbon and a short video of an ordinary day. Everything else on the list is a bonus. Seal the box, label it with a real year and store it somewhere you'll remember.

Frequently asked questions