A calendar for someone who can't read one yet
Six navy crescent moons across the chest, three struck through, count down the one unit a child who can't read a calendar actually has — how many times they sleep first.

Six identical navy crescent moons sit in a row across the chest. The first three are struck through, one firm diagonal each. The remaining three are untouched. Beneath, in small plain capitals: THREE MORE SLEEPS.
A calendar means nothing to someone who can't read dates yet, so he built his own unit out of the only marker that reliably repeats: going to sleep and waking up again. It works, and it only works today.
Why moons and a struck-through line instead of just writing "three days"?
Because "three days" is an adult's unit, translated for him, and this is the unit he actually uses — a count of sleeps, crossed off one at a time as each one happens.
Days are an abstraction he can't verify himself; he has no way to check that a day has definitely elapsed except by noticing it got dark and light again, which is exactly what a night's sleep is. The moons aren't decoration standing in for a number — they're the actual instrument he counts with, drawn the way he'd draw them if you handed him the marker.
Isn't a design that's only correct on one specific day a flaw?
No — it's the reason to make it now rather than later, because tomorrow it becomes TWO MORE SLEEPS and the shirt printed today will never say that.
A generic countdown shirt with a blank you fill in yourself would dodge the problem by staying permanently vague, which also makes it permanently uninteresting. This one is right for exactly one stretch of days and wrong forever after — struck-through moons frozen at three, for an event that, by the time anyone reads the shirt again, has already happened or long since passed. That's not a printing error to fix; it's a photograph of a specific count taken on a specific evening.
Why does crossing a moon off matter more than just watching a number go down?
Because the crossing-out is an action he performs, not a number that changes on its own — and performing it is most of what makes the wait bearable.
A digital countdown updates itself and asks nothing of the child watching it. A moon he strikes through himself, each night, is a small ritual he controls in a stretch of time he otherwise has no control over at all. It sits close to the fixed sequence a bedtime has to run in before anyone's allowed to switch the light off — both are ways of making an unmeasurable stretch of time feel like something with steps in it.
Does this only work for counting down to a specific day?
Mostly, and that's the point — sleeps measure distance to a known event, not general time, so it suits a trip, a visit or a birthday far better than it suits an ordinary week with nothing at the end of it.
Ask him how long ago something happened and the unit stops working nearly as well; sleeps count forward to a thing he's waiting for, not backward through days that have already blurred together. That's a different problem from working out how far he can count before the pattern breaks down — this unit doesn't need the number system at all, only the ability to notice one has passed.
Who else in the house counts this way, and why does it stop?
Nobody else, by the time this shirt gets made — sleeps is a unit adults gave up using as soon as they could read a calendar reliably, which for most people was a long time ago.
The household still translates for him without noticing: "it's in three sleeps" gets said out loud constantly, by adults who privately think in dates and dial the answer down into his unit before speaking. He isn't slower for using it — he's using the one measuring tool that's actually available to him, in the same way a reward chart works because the marks are visible, not because the concept of reward is explained.
Whose design is this, and does anybody need to grant permission?
Nobody's but his. A crescent moon is a shape nobody owns, and the counting method belongs to him, not to any calendar, app or franchise that happens to use a similar icon.
There's no logo standing behind it and nothing here that resembles a branded countdown product — the moons are drawn plainly enough that the closest thing they resemble is the sky. Style has no owner; this particular arrangement, struck through in this particular order, is simply his.
Does it print well?
Yes, provided the moons stay flat and identical — six matching solid shapes read clearly at fabric's scale, where six slightly different hand-drawn crescents would look like a mistake rather than a set.
One dark navy ink against a pale ground carries the whole design; the diagonal strike-throughs should stay bold and single, not scribbled, so the three crossed and three standing read instantly from across a room. Small plain capitals for the caption survive far better here than anything scripted or cursive would at this size.
How do I get one made?
Describe the countdown at JustOG — what the six moons should mark, and how many are struck through today. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
Tomorrow it's two moons left standing, and the shirt printed tonight will already be out of date.