5 things that help during a power outage with a baby

Independently chosen — nobody pays to be on a list, and we say what didn't make it. How we pick the 5.

The five, at a glance

1Fill a vacuum flask before the lights go out2Set a four-hour fridge timer and then stop opening it3Layer the baby — do not try to heat the room4Move expressed milk to a cooler bag early, not after5Use a clip-on book light for night feeds, not the lantern
1

Fill a vacuum flask before the lights go out

Electric bottle warmers and microwaves vanish the moment the grid goes down, and heating a bottle in a pan of water on a gas hob produces uneven hot spots that are hard to detect by wrist-testing alone. A wide-neck vacuum flask filled with just-boiled water holds above 70°C for four to six hours, which lets you warm a bottle by submersion — the bottle heats by conduction from the surrounding water, the same gentle mechanism as a proper warmer, with no plug required. One flask of hot water can cover three or four feeds in sequence. The move that most people miss is filling it before the outage deepens, not during — as soon as there is a weather warning or the power feels unreliable, fill it and seal it.

USDA food safety during a power outage

Try it
Fill a wide-neck vacuum flask with just-boiled water and seal it immediately — test yours beforehand with a thermometer to confirm it holds above 70°C for at least four hours, because not all flasks are equal.
To warm a bottle, stand it upright in the flask, pour hot water around it to the shoulder of the bottle, replace the lid loosely for three to five minutes, then test on the inside of your wrist — neutral, not warm.
If you use powdered formula: make each bottle fresh using the hot flask water per your formula tin's instructions, then cool briefly before feeding. Test the temperature every time.
2

Set a four-hour fridge timer and then stop opening it

A closed fridge holds temperature below 40°F (4°C) for approximately four hours after power cuts — but every time you open the door, you shed fifteen to twenty minutes off that window. The specific mistake parents make is opening it every twenty minutes to check on stored breast milk or prepared formula, which is precisely what accelerates the warming. The four-hour rule is an absolute, not a rough guide: prepared formula and expressed milk above 40°F for more than four hours should be discarded. Knowing the exact clock start time removes the temptation to guess whether it is probably still okay.

USDA food safety during a power outage

Try it
The moment power goes, note the exact time and set a phone alarm for four hours — treat that alarm as the decision point, not the moment you feel the urge to check.
If you have ice packs in the freezer, move them into the fridge immediately to buy extra cold time; transfer the most critical items (expressed milk, opened formula) into a cooler bag with ice if you have one.
After the four-hour mark, discard any breast milk or prepared formula that has been at or above room temperature — if in doubt, throw it out. Formula is replaceable.
3

Layer the baby — do not try to heat the room

The instinct is to find a way to warm the space — close every door, block every draught, maybe crack the gas oven. The problem is that babies lose heat fastest through their heads and through contact with cold surfaces, not through ambient air temperature, so the room temperature matters less than how the baby is dressed. A room that drops from 20°C to 16°C overnight is uncomfortable for adults but manageable for a well-dressed infant — and the improvised heating fixes (leaving a gas oven open, running a fuel-burning camp stove indoors) are genuine carbon monoxide risks that belong nowhere near a baby. One extra layer is the right tool here; it costs nothing and requires no power.

Ready.gov — power outages

Try it
Dress yourself first, then add one thin layer to the baby — a cotton vest under the sleep suit, or the sleep suit plus a light sleep sack. One extra layer is roughly equivalent to 1–2°C of ambient warmth.
If the house is dropping significantly, move the baby's sleep space to the warmest interior room — usually a central bedroom or wherever the hot-water tank is — rather than trying to heat a large room with outside walls.
Never use a gas oven, fuel-burning camp stove, or unvented heater indoors for warmth. If you are genuinely uncertain whether the baby is warm enough, call NHS 111 or your local paediatric nurse line — do not take temperature thresholds from a checklist.
4

Move expressed milk to a cooler bag early, not after

Most parents wait until the fridge feels warm before moving stored breast milk to a cooler bag — at which point the milk has already been warming for an hour or more. The key behaviour is to move it immediately at the start of the outage, before the fridge temperature has shifted at all. A soft-sided cooler bag with two frozen ice packs can hold below 4°C for up to 24 hours if you keep it closed and put it somewhere cool — longer than most outages actually last. The ice packs are already frozen in your freezer; this is one of those preps that costs nothing if you already own them and only requires acting early.

USDA food safety during a power outage

Try it
Keep a soft-sided cooler bag and two reusable ice packs in the freezer as standard kit — not in a cupboard, in the freezer, so they are already at temperature when you need them.
At the first sign of an outage, immediately transfer expressed breast milk to the cooler bag with both ice packs, seal it, and place it on the floor of an interior cupboard (dark and away from heat sources).
Refer to USDA FoodSafety.gov for the specific temperature-and-time guidance on expressed milk — it is worth reading once before you need it, so the four-hour and 24-hour rules are already in your head.
5

Use a clip-on book light for night feeds, not the lantern

The instinct is to reach for the big camping lantern — bright, reassuring, covers the whole room. The problem is that at 3am, bright white light signals daytime to an infant's developing circadian system and makes resettling afterwards significantly harder. What you actually need for a night feed is a very dim, warm-toned light directed at the task: enough to check a nappy, read the formula scoop lines, or see a latch — not enough to illuminate the ceiling. A small clip-on book light with a warm amber setting costs under £8, runs for 40-plus hours on two AAA batteries, clips to a nappy bag or cot rail, and is genuinely hands-free in a way that holding a phone torch in your teeth is not.

Try it
Buy one before you need it and keep it with the nappy kit, not with the camping gear — it needs to be in reach when the lights go at 2am, not in a bag in the garage.
Set it to its warmest, dimmest setting for night feeds; keep two spare AAA batteries in the same bag, taped to the back of the light.
Reserve the camping lantern for navigating the flat and for rooms where you need broader coverage — use the book light for anything involving the baby directly.

What didn't make the list

A dedicated battery-powered bottle warmer

They exist and they work, but they are a single-purpose battery-dependent device you are unlikely to have charged and within reach when the power goes at 2am. The vacuum flask method costs nothing if you already own a thermos, works for the full duration of any realistic outage without recharging, and has nothing to run flat or break. The gear is not the answer here.

Stockpiling ready-to-feed formula cartons

The instinct is right — sealed cartons need no water prep and remove the biggest logistical headache. Keeping two or three on a shelf is genuinely sensible. But as a primary outage strategy they are expensive, have a shorter shelf-life than powder, and do nothing for families who are breastfeeding. The thermos-and-powder system is cheaper and more durable as the core plan; the cartons are a sensible backup, not a standalone tip.

Questions people ask

Can I heat formula on a camping stove during a power cut?

A gas camping stove can heat water for the flask method described above — heat the water in a pan, pour it into the flask, then use the flask to warm the bottle by submersion. The critical rule is outdoors or genuinely well-ventilated space only: carbon monoxide from any fuel-burning appliance builds up quickly indoors and is invisible and odourless. If ventilation is uncertain, the flask filled before the outage is the safer default. Never use a camping stove, fuel-burning heater, or generator indoors or in a garage.

What about breastfeeding — does the outage change anything?

Breastfeeding removes the formula-prep and bottle-warming problem entirely, which is a genuine practical advantage. The things that still apply are warmth (front-carrying the baby uses your body heat directly and frees your hands), the cooler-bag guidance for any expressed milk you have stored, and the book-light tip for night feeds. If you are pumping, a power cut creates specific challenges around pump power and storage that a lactation consultant or your health visitor is better placed to advise on than a logistics checklist.

Is it safe to use candles for light when feeding at night?

Candles carry a real fire risk, especially with sleep deprivation — an open flame near loose muslins or a blanket, managed by a very tired adult, is not a combination to invite. A battery LED lantern or clip-on book light is cheap, just as effective, and can be left unattended without concern. If candles are all you have, keep them on a stable surface well away from anything flammable, never leave them lit when you leave the room, and extinguish them before you fall asleep.

Sources

  1. USDA food safety during a power outage
  2. CDC — food safety during a power outage
  3. Ready.gov — power outages
  4. American Red Cross — how to prepare for emergencies
Illustration of Theo Brennan

Theo writes our Prep lists. He is not a survival expert — he is someone who has sat through enough multi-day power cuts and storm warnings to learn what actually matters when the lights go out, and what is just expensive kit gathering dust. Every list sticks to the calm, useful end of preparedness: food, water, warmth, light. For anything medical or genuinely dangerous, he will point you to the Red Cross or your emergency services — never pretend a checklist is a substitute. More from Theo Brennan

Keep going

Five things that help, every Sunday.

One list a week, picked by hand.