When there are two of you, travel prep splits itself up without anyone really deciding it should. One of you sorts the boarding passes, the other remembers the kids' medication. When it's just you, every single one of those jobs lands on your desk, and the ones that get missed are rarely the big, obvious ones. It's the small admin that falls through the cracks, the stuff that only matters when you're standing at a check-in counter and realise you needed it twenty minutes ago.
The paperwork that trips people up
Everyone remembers passports. Fewer people remember that if you're taking the kids overseas without their other parent, some countries and some airlines want to see a signed letter of consent from them, especially if your surname is different to your child's. It isn't always asked for, but when it is, it's asked for at the gate, not somewhere you can duck off and print one. If there's a custody order or a parenting plan involved, a copy of that is worth packing too, even if you're fairly sure you won't need it.
Worth doing the week before, not the night before: check every passport expiry date, including yours. A lot of countries want six months' validity left on arrival, and that catches out more parents than you'd think, usually because they checked the kids' passports and forgot their own.
Medical stuff, written down somewhere boring and reliable
If a doctor or a pharmacist ends up needing your child's information and you're not standing right there, a notes app full of half-remembered details isn't much use. A simple written list, allergies, regular medication and doses, your GP's number, Medicare details, costs nothing and takes ten minutes. Keep medication in its original packaging, especially anything prescribed, and carry a bit more than you think you'll need. Flights get delayed. Pharmacies overseas don't stock what you expect them to.
Someone back home who actually knows the plan
Not just "I'll text you when I land." A specific person who has your flight numbers, where you're staying each night, and a general idea of the plan, kept somewhere other than their memory. If something goes sideways, a friend trying to explain to a hospital or an embassy which hotel you're even in is not the moment to be figuring that out from scratch. A shared note or a quick email works fine. It doesn't need to be fancy, it just needs to exist somewhere other than your own head.
Staying reachable, properly
This is the one that catches solo-parent trips out more than almost anything else. You're the only adult, which means you're the only person who can make a decision if something happens, and that's a genuinely bad moment to discover your phone has no signal. Roaming can be expensive enough that people switch it off without thinking, and then spend the first day of the trip hunting for airport WiFi instead of actually being present with the kids. A lot of travelling mums sort a local data plan before they fly instead, an eSIM from somewhere like Holafly installs before you even leave home and is already working when you land, so you're not relying on a hotel's patchy WiFi to look up directions, book a cab, or just let someone know you've landed safely. It's one less thing to sort out while also wrangling bags, kids and a jet-lagged toddler.
Whatever you use, make sure the kids know how to reach you too, even a simple rule like "stay where you are and I'll come to you" if you get separated in an airport or a theme park, said out loud before you land, not worked out in a panic.
Backups, because plans change
A rideshare app that works in the country you're visiting, downloaded before you go rather than discovered mid-meltdown at arrivals. A screenshot of your accommodation address and booking confirmation, saved offline, in case the app won't load. A second card or some emergency cash kept separate from your main wallet, since losing a bag with every payment method in it is a very different problem to losing one with a spare. None of this needs a spreadsheet. It just needs five minutes and somewhere to put it before the trip, not during it.
The job nobody puts on a checklist
The actual hardest part of solo travel with kids isn't any single task, it's holding all of them in your head at once while also being the fun parent, the organised parent and the only parent, all day, every day of the trip. Getting a few of the boring bits sorted in advance, the consent letter, the medication list, a working phone, someone back home with the details, doesn't make the trip easier exactly. It just means the things that go wrong are the normal holiday things, a missed train, a grumpy kid, a lost sock, rather than something that could have been avoided with ten quiet minutes the week before you left.
