Fresh purées are perishable, a couple of days in the fridge, so small baby food makers sell them frozen, in cubes. Frozen at 0°F they stay safe; what ends them is quality: freezer burn on the cubes, ice crystals, and fruit and vegetable flavors that fade and darken over months. Once a parent thaws a cube, it's back to a day or two in the fridge. In the example below, a Connecticut baby food maker's frozen trays passed every test through day 120, and they say best by 90 days frozen, a 25% margin. Below is what ends baby food's shelf life, frozen against thawed, the study, the date on the tray, and a free template.
The short version
- Fresh purées keep a couple of days; frozen cubes, months.
- Cool fast, then blast freeze.
- Freezer burn, ice and fading color end frozen cubes.
- Thawed cubes go back to a day or two in the fridge.
- Run a real-time study, frozen, and leave a margin.
- Print "Keep frozen", the date and how long once thawed.
- TaroStack gives every batch its date from the shelf life you set. More below.
What ends its shelf life
| What ends it | What happens | What slows it |
|---|---|---|
| Freezer burn | Cube surfaces dry and pale | Sleeved trays sealed tight; a steady 0°F |
| Color and flavor | Apples and sweet potatoes darken and fade | Fast freezing; a little lemon in fruit purées; cold storage |
| Ice crystals | Thaw-refreeze swings make purées watery | A freezer that holds 0°F |
| Thawing | Back to a perishable food | "Use within 48 hours of thawing; don't refreeze" |
Making cubes by the hundred is in how to make baby food in bulk, and the testing budget in baby food business plan.
How it's stored
| Stored | In the example's tests | On the label |
|---|---|---|
| Frozen tray at 0°F | Passed every test through day 120 | Best by 3 months frozen |
| Thawed in the fridge | Not part of the study | "Use within 48 hours of thawing" |
| Fresh, never frozen | Not sold that way | Trays go to the blast freezer the day they're made |
The thawed line is the maker's instruction, cautious on purpose, because the eater is a baby.
An example: a shelf life study
Thimble Islands Kitchen, the made-up baby food maker in Branford, Connecticut, I use in these examples, kept frozen trays of sweet potato and apple purée from one production day at 0°F and thawed two at each pull:
| Test | Pass if | Day 0 | Day 30 | Day 60 | Day 90 | Day 120 | Day 180 |
|---|---|---|---|---|---|---|---|
| Color score, 1 to 9 | at least 6 | 9 | 9 | 8 | 7 | 6 | 5 |
| Flavor score, 1 to 9 | at least 6 | 9 | 9 | 8 | 8 | 7 | 5 |
| Freezer burn, 1 to 5 | at most 2 | 1 | 1 | 1 | 2 | 2 | 3 |
| All pass? | Pass | Pass | Pass | Pass | Pass | Fail |
Everything passed through day 120; at day 180 the color and flavor fell below 6 and freezer burn showed. Taking a 25% margin off day 120 gives 90 days, three months. How the pulls and margin are planned is in shelf life testing.
The date on the label
Frozen purées carry a quality date, "Best by", with "Keep frozen" and how long they keep once thawed. In California, food made from July 1, 2026 that shows a date uses "BEST if Used by" for quality, in sell by date law, and how to write the date is in best by date format. The margins are in baby food profit margin.
Get the template
Download the baby food shelf life study template. One sheet: the product, the lot tested, the day it was made, how it's stored and the margin to leave; then each test with its limit and the result at each pull. It marks each pull pass or fail, finds the last day everything passed, takes the margin off, and gives the shelf life for the label and the date for a batch made today. It's an ordinary Excel file with no macros, and it works in Google Sheets, LibreOffice and Numbers.
Where this stops working
The study gives one date for one purée. Eight purées, a production day every week, trays at a grocer and in delivery boxes, and lab results by produce lot: someone has to date each day's trays and send the oldest first.
How TaroStack does it
TaroStack gives every batch its date from the shelf life you set, and sends the oldest out first.
Dates from the shelf life. Each purée carries its shelf life in days, and each batch's lot gets its production date and the date that follows from it.
First-expired-first-out. Orders take the oldest lots first by default, and a grocer can be set to take only stock with enough days left.
What's coming up. A forecast shows what will expire unsold and what it costs, and anything thrown out is recorded with its reason, expired or spoiled, so waste shows by item.
| The job | Spreadsheet | In TaroStack |
|---|---|---|
| The date on a batch | Worked out by hand | From the shelf life, on the lot |
| Which batch goes out first | Dates on tape | First-expired-first-out |
| Stock with enough days for a grocer | Checked by hand | The customer's shelf-life rule |
| What expired last month | Not counted | Waste by reason |
Lots, dates, first-expired-first-out and the expiry forecast are on every plan, from $49 a month. The first 30 days are free, with no credit card. If you'd like a hand setting up, ask, and we'll do it with you.