How long can prepared infant formula stand, and at what temperature should it be served?
Applies to age: 0–12 months
In short
Prepare the formula one portion per feeding, and throw away what is left in the bottle after the feeding. Serve it at body temperature: warm or cool, but not hot.
What is normal
All claims: international norm
- Check the temperature of the prepared formula on the inside of your wrist before giving it to your baby.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Test the temperature of the formula on the inside of your wrist before giving it to your baby.
NHS · open the source · accessed: 2026-10-12 · license [1]
- Formula given to a baby should be at body temperature, which means warm or cool, but not hot.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
It should be body temperature, which means it should feel warm or cool, but not hot.
NHS · open the source · accessed: 2026-10-12 · license [1]
- If prepared formula is left in the bottle after a feeding, it should be thrown away.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
If there is any made-up formula left in the bottle after a feed, throw it away.
NHS · open the source · accessed: 2026-10-12 · license [1]
- To reduce the risk of infection, it is best to prepare formula one portion at a time, as the baby needs it.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
To reduce the risk of infection, it's best to make up feeds 1 at a time, as your baby needs them.
NHS · open the source · accessed: 2026-10-12 · license [1]
- Bacteria multiply very fast at room temperature.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Bacteria multiply very fast at room temperature.
NHS · open the source · accessed: 2026-10-12 · license [1]
- Even in the fridge, bacteria in the formula can survive and multiply, although more slowly.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Even when a feed is kept in a fridge, bacteria can still survive and multiply, although more slowly.
NHS · open the source · accessed: 2026-10-12 · license [1]
- To dissolve the powder, use water that has been boiled and left to cool for no more than 30 minutes, so that it is at least 70°C.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Then leave the water to cool for no more than 30 minutes, so that it remains at a temperature of at least 70C.
NHS · open the source · accessed: 2026-10-12 · license [1]
- Formula is never warmed in a microwave, because it may heat unevenly and burn the baby's mouth.
Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Never warm up formula in a microwave, as it may heat the feed unevenly and burn your baby's mouth.
NHS · open the source · accessed: 2026-10-12 · license [1]
The sources in our registry do not say when to see a doctor.
international norm “International norm” next to a section heading means its claims come from a non-Polish source, because no Polish source in our registry covers this topic. When this applies to only some of the claims, the foreign ones carry the same label next to their source.
Sources
- NHS (nhs.uk, Anglia)License: Open Government Licence v3.0. Source: NHS (nhs.uk, Anglia). Content summarized and translated by the editors; changed relative to the original. Contains public sector information licensed under the Open Government Licence v3.0. The summary is ours and is not attributed to the NHS.