The go-bag your baby outgrows every couple of months

Quick answer: Pack ready-to-feed formula with disposable nipples, even if you normally use powder. If you're breastfeeding, plan around keeping Mom fed and hydrated and her milk cool. Then put a calendar reminder on the bag, because a baby outgrows its contents faster than any adult kit ever expires.

The 2 a.m. outage is a different animal when there's a newborn in the house. You can skip a meal. You can sit in the dark and wait. A baby gives you roughly three hours before the whole house knows about it.

Preparing for that doesn't take a bunker. It takes a plan for the feeding, a bag by the door, and about an hour on a Sunday.

Plan the feeding before you pack the bag

Ask your pediatrician how much your baby takes in a full day. Multiply by three. That's your minimum, and it's the number that tells you how much to stock. Don't guess, because the figure changes month to month.

CDC guidance for emergencies points parents the same direction: ready-to-feed liquid formula is the safest choice when you can't count on clean water or power. It needs no mixing and no heating. Get the small bottles with disposable nipples for the bag. Check the label for how long an opened bottle keeps. Most need a fridge and a short window.

One honest trade-off. Ready-to-feed costs more per ounce than powder. So don't switch the whole household to it. Keep a few days' worth in the bag, use powder day to day, and rotate the ready-to-feed into regular use before it expires.

Don't hoard a mountain of formula either. During the 2022 shortage, pediatric groups asked parents not to stockpile beyond a week or two of supply, because every extra case on your shelf was an empty spot on somebody else's.

If you're using powder, water is the problem

Powdered formula isn't sterile, and the water you mix it with matters. If officials issue a boil-water advisory or you don't trust the tap, CDC says to use bottled water or bring tap water to a rolling boil for one minute. Let it cool before mixing. Do that over a camp stove or grill outdoors, never a charcoal grill or gas appliance inside the house.

Three rules that don't bend:

• Mix exactly as the label says. Never stretch formula with extra water to make it last. A baby's kidneys can't handle it.
• Don't make homemade formula. Not from a website, not from your grandmother's memory.
• Watch the clock. Prepared formula left at room temperature should be used within two hours. Once the baby starts a bottle, finish it within an hour and toss the rest.

Water for the baby is for mixing only. Babies under six months shouldn't get plain water to drink, per the American Academy of Pediatrics.

If you're breastfeeding, Mom is the supply chain

Her body doesn't need the grid. That's the good news. The bad news is that she needs food, water and rest, and an outage makes all three harder.

That's your job, Dad. Feeding her is feeding the baby. Keep her water bottle full, hand her a snack before she asks, and take every non-feeding task off her list. Diapers, bottles, flashlights, the neighbor knocking on the door. All yours.

If she pumps, a manual pump is cheap insurance, because an electric one is a paperweight without power. Hand expression works too, and a lactation consultant can teach it in one visit.

For storing milk, CDC's numbers are worth taping inside the bag:

• Freshly expressed milk keeps up to four hours at room temperature.
• In an insulated cooler with frozen ice packs, up to 24 hours.
• In a refrigerator, up to four days.

USDA says a full freezer holds its temperature about 48 hours if you keep the door shut, and a half-full one about 24. A fridge is good for about four hours. Don't open either one to check on things. Frozen water bottles stacked in the freezer do double duty as ice and drinking water.

Warming and cleaning without a kitchen

Babies don't need warm milk. Room temperature is fine. If yours insists, set the bottle in a bowl of warm water for a few minutes. Never microwave it, power or no power, because hot spots can scald.

Cleaning is where outages quietly go wrong. CDC's approach: wash bottles and nipples with soap and safe water, then sanitize by boiling them for five minutes. If that's unrealistic at 3 a.m. in a cold house, this is one more reason the disposable-nipple ready-to-feed bottles earn their space in the bag.

What goes in the bag

Keep it by the door, in one bag you can grab with one hand while the other holds a baby.

• Diapers for at least three days. A newborn can run through eight to twelve a day, so that's a real stack.
• Wipes, diaper cream, a few plastic bags for the used ones
• Three changes of clothes, two swaddles or receiving blankets, a hat
• Ready-to-feed formula and disposable nipples, or a manual pump and storage bags
• A pacifier if your baby takes one
• A digital thermometer and a nasal aspirator
• A headlamp, so both hands are free
• A power bank and a charging cable
• A folder with the pediatrician's number, your insurance card, a copy of the birth certificate and immunization record

Medications are a question for your pediatrician. Ask which, if any, belong in the bag and how to dose them by weight. Don't guess and don't borrow a dosing chart from the internet.

The bag gets a baby-sized version of everything in The Seventy-Two Hour Kit Your Family Will Actually Use. Build the family kit first, then add this one on top.

Cold, heat and sleep

In winter, dress the baby in layers and a hat, and keep the sleep space clear. The AAP's safe-sleep advice doesn't get suspended in an emergency. Flat, firm surface, no loose blankets, no sharing a bed. Extra layers on the baby, not extra stuff in the crib.

Never heat a room with a gas oven, a charcoal grill, or a generator running indoors or near a window. Carbon monoxide is the real killer after storms. The rules are laid out in Twenty Feet From the House and Other Generator Rules.

In summer heat, the danger flips. Babies overheat faster than adults. Go to the coolest room, dress them lightly, feed on demand, and never leave one in a parked car for a minute. If the house is hot enough that you're worried, leave for somewhere with air conditioning. A library, a relative's house, a shelter. That's judgment, not weakness.

For longer outages, the planning in What a Week Without Power Actually Takes still applies, with a baby's schedule laid over it.

The part nobody tells you: it expires

This is the real angle. An adult kit sits in a closet for a year. A baby bag goes stale every few weeks. The newborn diapers in it won't fit in two months. The sleepers are too small. The formula has a date, and so does the ready-to-feed.

Pick a trigger and stick to it. Every time you buy the next diaper size, repack the bag. Every time the clocks change, check the formula dates. Set a recurring reminder on your phone titled "baby bag," and don't dismiss it.

One more habit worth stealing. If you grab the bag and head to Grandma's or a friend's house, bring the formula and diapers with you rather than raiding their pantry, and leave their guest room cleaner than you found it. An outage is hard on everybody, and the house that takes you in has its own worries.

A baby doesn't care about the grid. It cares that somebody it trusts is calm and has a bottle ready. Build the bag so that somebody is you.