Formula feeding guide
Formula Feeding Logs: What Comes Before the Numbers
Formula looks like the easy thing to log — the markings are right there on the bottle. In practice, what was prepared and what was actually taken get tangled together within a day. And how long a made-up bottle has been sitting out is not information you want living in someone's memory. A formula log is about safety as much as arithmetic.
Last reviewed 2026-08-08 · A general record-keeping guide, not medical advice.
Three numbers per bottle
Formula records go wrong at exactly one point: "how much did they have?" gets answered differently by different people. Splitting it into three removes the ambiguity.
- Prepared: what went into the bottle
- Left: what was still there at the end
- Taken: the difference
The third is arithmetic, so you only ever type two. But that split is what turns "made 150, left 30" into a clean "took 120."
Why the preparation time earns its place
This is the field most often skipped, and the one that actually touches safety.
Someone taking over at 3am finds a bottle on the counter. The only way to judge whether it is usable is a recorded preparation time. With it, the decision takes a second. Without it, the bottle usually gets poured away — or, in the worst case, gets used when it should not have been.
What to look at across a day
| Metric | What it tells you | | --- | --- | | Average taken per feed | Whether it shifted against recent days | | Times left over | Consistently leaving suggests you are making too much | | Longest gap | Typically overnight | | Total feeds | Whether today broke the usual pattern |
A run of days where every bottle is drained and the baby still seems hungry — or the reverse — is exactly the kind of thing worth bringing to a check-up.
Keeping combination feeding readable
Mixed feeding is where records get muddiest. Formula volumes are exact and breastfeeds are not, so combining them in one field destroys both.
Always record the method. The breast side is covered in breastfeeding logs, and passing information between caregivers is covered in formula and breastfeeding handoffs.
What a log cannot cover
A record handles times and volumes. Sterilising bottles, water temperature and storage conditions are not logging problems — they are matters of following a fixed standard.
In a household where several people prepare bottles, writing that standard down once and putting it somewhere visible works better than any log. Records capture what was done; they do not tell anyone what should be done.
Frequently asked questions
- Should I log the amount prepared or the amount taken?
- Both. Prepared alone tells you nothing about intake; taken alone leaves no trace of what happened to the rest. With the two side by side, the leftover is obvious.
- Can leftover formula be offered again later?
- Once a baby has fed from a bottle, the remainder can grow bacteria and the standard advice is to discard it rather than reuse it. Exact storage limits vary, so follow the manufacturer's instructions and your clinician's guidance.
- Can the log tell me when to increase the volume?
- No. How much a baby needs depends on age, weight and growth. The log only helps you notice a change — "lately every bottle is finished and they still want more" — and any increase should be discussed with your clinician.
- I want to make bottles ahead for the night. Can the log manage that?
- Recording the preparation time gives whoever picks the bottle up a basis for deciding whether to use it. Whether making bottles ahead is safe at all depends on storage temperature and time, so follow manufacturer and health authority guidance first.
- Different people in the house mix at different concentrations.
- Concentration is not something to adjust freely. Share the water-to-powder ratio printed on the tin and have everyone follow it exactly, and recording how many millilitres were made with how many scoops makes any drift easy to spot.
Sources
Shared records instead of memory