Packing list for a toddler flight: the carry-on checklist

The golden rule: travel day plus one

Your carry-on is your survival kit for delays, missed connections and checked bags that take the scenic route. If you didn't see your suitcase until tomorrow, everyone should still be fed, changed and reasonably clean.

That matters most for four things: diapers, medication, feeds and a change of clothes. Everything else can be bought, borrowed or lived without for a day.

Diapers and changing

The rule of thumb Packworthy uses: roughly one diaper for every hour of travel, plus a day's worth as a delay buffer. "Travel" means door to door, not just time in the air. A 3-hour flight with an hour to the airport, 90 minutes of security and boarding, and an hour at the other end is closer to 6 or 7 hours.

How many is "a day's worth"? It depends on age. Typical starting points are about 6 a day for a 1-to-2-year-old and about 4 to 5 a day for a 2-to-3-year-old. Our diaper guide has the full age table and the math for the rest of the trip.

What else goes in the changing kit:

• A fresh diaper right before you board. The AAP suggests it, and it buys you time before the first plane-bathroom change.
• Wipes. Two or three per change adds up fast, and they clean tray tables too.
• A small, foldable changing pad. Plane changing tables are tiny and not always available.
• Diaper cream in a tube of 3.4 oz or less, so it can go in your liquids bag.
• A compact diaper clutch. Plane bathrooms barely fit one adult. Take a slim pouch with two diapers, wipes and the pad, not the whole diaper bag.
• Zip bags or a wet bag for dirty clothes and leaks.
• Potty training? Pull-ups are usually less stressful than underwear on a flight, even for a child who is mostly trained. Seatbelt signs and bathroom lines do not care about anyone's timing.

Clothes

• One full spare outfit for your child, two if they're under 2 or prone to blowouts.
• A spare top for you. Spills, spit-up and leaks don't only land on the child.
• Layers and socks. Planes run hot at the gate and cold in the air, and little shoes come off within ten minutes.

Feeding and ear pressure

What TSA allows

Under the TSA's general 3-1-1 liquids rule, each traveler can carry liquids in containers of 3.4 oz (100 ml) or less, all in one quart-size bag. Babies and toddlers get an exemption. According to TSA's baby formula page, formula, breast milk, toddler drinks and baby or toddler food (including puree pouches) are allowed in carry-ons in quantities over 3.4 oz, and they don't need to fit in your quart bag.

How to get through smoothly:

• Tell the officer at the start of screening that you have formula, breast milk or baby food over 3.4 oz.
• Take those items out of your bag so they can be screened separately. They may be tested.
• Ice packs and gel packs used to cool breast milk or formula are allowed, even if partly melted.
• Clear bottles are easier to screen than pouches or bags, according to TSA.
• Don't want milk X-rayed or opened? Say so, and allow time for alternative screening.
• Pack a "reasonable amount" for the travel day. TSA doesn't publish a fixed limit.
• Mixing powdered formula? The American Academy of Pediatrics' Flying With Baby guide says to pack water for mixing separately and tell security about it, along with the formula. Pre-measured powder in a dispenser makes mid-flight feeds easier, and ready-to-feed formula skips warming and mixing altogether.
• Kids 12 and under can keep their shoes, light jackets and hats on at TSA screening, and strollers, car seats and carriers go through the X-ray, per TSA's traveling with children page.

Rules change, and other countries have their own. Check tsa.gov before you fly, and check your return airport's rules too.

Warming a bottle

Ask a flight attendant for a cup of hot water and stand the bottle in it, or fill a wide insulated flask with hot water after security.

Takeoff and landing

For babies, feeding (breast or bottle) or offering a pacifier during takeoff and landing can help with ear pressure. Older kids can drink from a straw cup, chew gum or suck on a hard candy, but only once they're old enough to do that without a choking risk. If your child has had an ear infection or ear surgery in the two weeks before your trip, the AAP advises asking their doctor whether it's OK to fly. Landing tends to be the harder part, so save a bottle or a snack for the descent rather than using it all at the gate.

About Benadryl

The AAP is direct about this one: don't give your child diphenhydramine (Benadryl) to make them sleep on a flight without asking your pediatrician. It can have serious side effects, and some kids get more wired, not less. That's not something you want to discover at cruising altitude.

Snacks

Pack more than you think, in small zip bags. A cereal eaten one piece at a time beats a granola bar that's gone in thirty seconds.

Car seats, CARES and strollers

Under 2: lap child or own seat?

US rules allow a child under 2 to fly on an adult's lap. The FAA's position is clear, though: on its Kids' Corner page, it says the safest place for a child under 2 is in an approved child restraint in their own seat, and that buying a ticket for your child is the only way to guarantee you can use one. Whether to buy the seat is your call.

Bringing the car seat on board

• Look for the label: "This restraint is certified for use in motor vehicles and aircraft", usually in red. Find it before you get to the gate.
• Practice installing it with a lap belt at home. It's a different skill than your car's LATCH system.

The CARES harness

The FAA-approved CARES harness is a lighter option for kids who can sit up on their own, weigh 22 to 44 lb and are 40 inches tall or less, in their own seat. It's approved for aircraft only, not cars. The FAA warns about counterfeits sold online, so buy from the manufacturer.

Where to sit

• A window seat is usually best for a car seat, so it doesn't block anyone's way out. The AAP also points out that aisle seats put little arms in the path of drink carts and falling bags.
• Avoid exit rows. Airlines won't seat young children there anyway.
• Bassinets on long-haul flights usually have a limit around 6 months or 20 lb, and babies who can't sit up yet. It varies by airline, so ask when you book.
• Sitting together: the US Department of Transportation keeps an Airline Family Seating Dashboard showing which airlines guarantee free adjacent seats for a child 13 or under and an accompanying adult. Conditions apply (for example, being on the same reservation), so book seats early either way.

Strollers

Car seats and strollers generally don't count toward your luggage allowance, and most airlines let you gate-check them, often at no charge, but policies on size, weight and what counts as free vary by airline and fare. Check your airline's current policy before you fly, and bring a stroller bag if you want to keep it clean.

Age-by-age: what changes

Baby (under 12 months)

• Feeds for the travel day plus a buffer, and a burp cloth (or two).
• A carrier, so you have two hands at security and in the aisle.
• Pacifiers on a clip, plus a spare in a zip bag.
• Extra diapers. Babies under a year use more per day, so err high.

Toddler (1 to 3)

• The comfort item, and maybe its understudy.
• Several small, new or long-forgotten toys, wrapped or bagged, revealed one at a time.
• Stickers, a reusable sticker book, or a water-reveal coloring pad (no markers on tray tables).
• Downloaded shows on a tablet, plus kid-size headphones.
• A spill-proof cup they already know how to use.

Kid (4 to 8)

• Their own small backpack with activities they packed (you check it).
• Gum or hard candy for ears, if they're old enough.
• A water bottle to fill after security.

Tween (9 to 12)

• Their own charger and a power bank. Tweens will run their battery flat by the first layover.
• Headphones, a book and a jacket they can manage themselves.

What parents forget

What parents forget: the wall brick. You packed the cable. The plug that goes in the wall is still behind the nightstand at home.

What parents forget: the spare top for themselves. The child's spare outfit gets packed. The adult's doesn't, until the first spill.

What parents forget: power bank rules. Spare lithium batteries and power banks must go in your carry-on, not checked bags, per the FAA. If an agent gate-checks your carry-on, take the power bank out first.

What parents forget: the seat pocket. Before you get off, check seat pockets, under seats and the floor for pacifiers, stuffed animals and phones.

Documents and ID

• Domestic US flights: TSA doesn't require ID for travelers under 18 (TSA FAQ). Airlines may ask for proof of age for a lap infant, such as a birth certificate, so check yours.
• International flights: everyone, including babies, needs their own passport. See our international travel checklist.
• Keep IDs and passports in the carry-on, never in the checked bag.
• Save boarding passes, hotel details and your airline's app offline.

Let the list adjust to your flight

Packworthy builds a list for each traveler based on their age, all inside one shared family trip, so whoever is packing alongside you sees the same list and what's already done. It already counts diapers for each day of the trip by your child's age. A rebuilt calculator that also works out the carry-on count from your hours of travel is coming soon. Until then, use the rule above for the travel day.

FAQ

How many diapers should I pack for a flight with a toddler? A good rule of thumb is about one diaper per hour of door-to-door travel, plus a full day's worth in case of delays. For a 1-to-2-year-old, a day's worth is about 6, so a 5-hour travel day means roughly 11 diapers in the carry-on.

Can I bring formula, breast milk and baby food through TSA? Yes. TSA allows formula, breast milk, toddler drinks and baby food over 3.4 oz in carry-on bags in reasonable quantities, outside your quart bag. Tell the officer at the start of screening and remove them for separate screening. Check tsa.gov for the current rule before you fly.

Does my toddler need ID to fly in the US? TSA doesn't require ID for children under 18 on domestic flights. Airlines can set their own rules, and some ask for proof of age for lap infants, so check with your airline.

Should I bring a car seat on the plane? The FAA recommends that children fly in an approved child restraint in their own seat, and buying a seat is the only way to guarantee you can use one. Make sure the seat has the "certified for use in motor vehicles and aircraft" label. For kids 22 to 44 lb, the FAA-approved CARES harness is a lighter option.

What helps with ear pain on takeoff and landing? Feeding a baby or offering a pacifier during takeoff and landing can help. Older kids can sip a drink, chew gum or suck on a hard candy if they're old enough. If there's been an ear infection in the last two weeks, ask your doctor before flying.

Should I give my toddler Benadryl to sleep on the plane? Not without talking to your pediatrician first. The AAP warns it can have serious side effects and can make some kids more alert, not less.

Related guides

• How many diapers to pack for vacation
• Carry-on only packing list
• International travel checklist