Carry-on travel with a toddler under three sounds like an impossible mission. It isn’t. It’s a system, and once you’ve built it, it holds up whether you’re flying two hours or twelve.
I’ve done it with a one-year-old on my hip and a diaper bag doubling as my personal item. I’ve also done it badly the first few times, which is really the only way anyone learns this.
Here’s the honest version: what actually works, what I got wrong the first time, and how to get through boarding without a meltdown – yours or his.
The Mistake That Taught Me This System
On our first few carry-on-only trips with a toddler, I packed like he was a slightly smaller adult. A full wardrobe of outfits, a proper wash bag, his own little rolling suitcase.
By security, he’d decided the suitcase was a walker, not luggage. By the gate, I was carrying it, him, and my own bag. That suitcase went into the closet when we got home and never came back out.
Kids under three don’t need their own bag. They need you to have a system that accounts for them.
Why Carry-On Only Actually Gets Easier With a Toddler, Not Harder
This sounds backwards, but a squirming two-year-old and a checked-bag carousel are a genuinely a bad combination. No folding a stroller at baggage claim, no waiting around with a kid who’s already hit their limit, no risk of the airline losing the bag with the only spare outfit in it.
One bag each, always in your hands, is less to track, not more.
What Actually Goes in the Carry-Ons
Rather than a separate bag, we built our son’s things into our own carry-ons and one small backpack he carries himself once he’s steady on his feet. The system between two carry-ons:
- 1.5 outfits per day, not more. Kids under 3 go through clothes fast, but they also don’t care what they’re wearing, so pattern-matched basics that mix and match beat “outfits.” Don’t forget layers.
- Basic Toiletries:
- Diapers: Enough diapers to bridge the gap. Pack enough to get from your door to the second day at your destination, that buys you time to pick up more once you’re settled into your accommodations.
- Wipes: One pack of wipes that pulls double duty. Great for diaper changes, sticky hands, wiping down a tray table, or cleaning up whatever spill comes next.
- Bandaids. A scraped knee or elbow is inevitable when you are out and about exploring cities and parks.
- Toothbrush and toothpaste.
- Kids sunscreen
- Medication, always, always, always, travel with a full bottle of kids tylenol and kids advil and any other medication your child might need. Trying to find a drugstore in another country when you kid has a high fever or ill can be extremely stressful (I learned the hard way). Not every country carries the same pharmaceuticals that you may have at home. Trying to read and translate a bottle of medication in another language can be a challenge.
- One comfort item, non-negotiable, always in the bag that stays with you at the gate, never checked, never buried at the bottom, not in the kids bag where it has potential to get lost.
The Toddler-Sized Backpack Travel Strategy
To start preparing our son for the years ahead, when he’ll carry his own carry-on for real, we got him a small kid-sized backpack. We went with a Hersrchel 18L bag and let our kid pick out which colour/pattern he liked.
The idea was simple: he packed what he needed for the plane. Snacks, small toys, a stuffy for comfort, headphones, and a tablet. Nothing overstuffed, just enough to keep him comfortable and entertained in flight.
Once we landed, that same bag switched jobs. Its new purpose was carrying what we needed throughout the day while exploring a city or hitting the trails: snacks, a small water bottle, and a couple of toys to keep him entertained at restaurants while we waited for our food. Usually a few Hot Wheels and Matchbox cars, and a small colouring kit.
One light kid size bag with two very different jobs.
The Gate-Check Stroller and Car Seat Question
You can gate-check a stroller and car seat at no charge on almost every airline. This is the move that keeps you carry-on only without giving up the stroller for the terminal.
It gets tagged at the gate, travels in the cargo hold for your specific flight, and comes back to you at the jet bridge on arrival rather than at the carousel. It doesn’t count against your carry-on allowance, since it’s checked at the door rather than carried on. Confirm your airline’s process before you fly, though a few require it at the check-in desk instead.
Do you actually need to travel with a car seat? We brought ours on a trip to Florida once, and it wasn’t worth the effort or the headache. Rental car companies will rent one out for a small fee, and plenty of destinations have dedicated baby gear rental services too. You can usually reserve gear online before you even land. In Toronto, Babonbo and Traveling Baby Company are both worth a look.
As for the stroller itself: bring one if your child is under three. Leave the big, heavy, clunky model at home, and opt for something that folds up small, handles narrow sidewalks, and can fit under your airplane seat or in the overhead bin if it ever comes to that (it rarely does). The gb Pockit Air All Terrain Ultra Compact Lightweight Travel Stroller was our go-to.
Liquids With a Toddler
This is its own puzzle, and I’ve written the full breakdown separately, but the short version for kids under 3: formula, breast milk, and toddler drinks are exempt from the standard 100ml container limit and can be carried in larger quantities, they just need to be declared separately at the screening checkpoint. Pack them somewhere accessible, not buried under clothes, because you’ll be asked to present them. For everything else in your own liquids bag, the full guide to staying under the carry-on liquid limit covers exactly how we keep a week of toiletries under 100ml per person.
Security With a Toddler in Your Arms
A few things that make this faster, not slower:
- Kids 12 and under don’t need to remove shoes or light jackets at screening under current US TSA guidance and CATSA for Canadian departures.
- Formula, breast milk, and baby food should be declared to the officer before the bin goes through, not after.
- Wearing a baby or toddler in a carrier through screening is allowed at some airports and not others. This varies enough that it’s worth checking your specific one in advance.
Frequently Asked Questions
Can you really travel carry-on only with a toddler? Yes, absolutely. The system is one bag per adult, a small child-carried backpack once they’re old enough to wear one, a gate-checked stroller and car seat, and a tightly kept 1.5-outfits-per-day rule. None of it requires checking a bag.
Do toddlers need their own carry-on bag? Not usually. Under age three, a separate rolling suitcase is more often a toy than functional luggage. Their belongings fit better distributed across the adults’ carry-ons until they’re old enough to actually manage a bag of their own.
Is gate-checking a stroller free? On nearly every major airline, yes, and it doesn’t count against your carry-on allowance. Confirm your specific airline’s policy before departure, since a few handle it slightly differently.
What liquids are exempt for babies and toddlers? Formula, breast milk, and toddler drinks are exempt from the standard container size limit, but they should be declared to the security officer separately from your one-litre bag.
More Guides for Traveling Light With Kids
If you’re building your whole family’s system rather than just the under-three piece, start with how we pack a carry-on for the whole family before the kids can carry their own, and the kids’ carry-on system that makes family travel easier once they’re a bit older and ready for their own bag.
Helpful Links
- Canadian Air Transport Security Authority (CATSA), traveling with children: catsa-acsta.gc.ca
- TSA, frequently asked questions: tsa.gov
The Bottom Line
Carry-on only with kids under age 3 isn’t about packing less stuff, it’s about packing it in the right place. Distribute their things across your bags instead of giving them one of their own, gate-check the stroller, keep the liquids that need declaring within easy reach, and the whole process gets simpler, not harder, with a toddler along.