Two rules decide how smoothly a family gets through a London airport. Baby milk, formula and baby food can go through security in containers of any reasonable size, but the baby has to be there. And since July 2026, children aged eight and over can use the automated passport eGates when you come back, which removes the long wait at the manned desks that used to catch families out.
Everything else is detail, but the detail varies a lot between London's airports, and the liquid rules now differ from terminal to terminal in a way that no traveller could guess. Heathrow and Gatwick have replaced the old 100ml limit with a two-litre one; Stansted and Luton have not.
This page covers the airport itself: security, pushchairs, the border, where to wait and what it costs to feed everybody. Getting there is a separate problem, and who pays what on London transport is set out in its own guide.
The family rules that changed in 2026
- eGates
- Open to children aged 8 and over, who must be at least 120cm tall and accompanied by an adult if under 18
- Liquids at Heathrow and Gatwick
- Containers up to 2 litres, kept in the bag; no separate plastic bag needed
- Liquids at Stansted and Luton
- Still 100ml per container, but they can stay in your hand luggage
- Baby milk and food
- Enough for the journey, at any UK airport, with no container limit set in law
- Breast milk
- Up to 2,000ml per container, allowed even if the baby is not travelling; never frozen
The liquid limit now depends on which airport you use
GOV.UK no longer gives a single national answer. Its guidance says the rules have changed at some UK airports and tells travellers to check with the airport before flying. That is not bureaucratic caution; the airports really do differ, because the new scanners have been installed in some places and not others.
| Airport | Maximum container | Separate plastic bag? | Laptops and tablets |
|---|---|---|---|
| Heathrow | 2 litres | No | Stay in the bag |
| Gatwick | 2 litres, but not in metal or double-walled containers | No | Stay in the bag |
| Luton | 100ml | No | Stay in the bag |
| Stansted | 100ml | No | May be asked to come out |
For families, the practical effect is largest at Heathrow and Gatwick. A full water bottle, a flask of squash, a pot of yoghurt and a tube of nappy cream can all go through without argument. At Stansted and Luton the same items over 100ml will be taken away, and no amount of explaining will change that.
Gatwick adds one detail that catches people: the container must not be metal or double-walled, so the insulated bottle you bought for the children has to be emptied first. Gatwick also insists that any drink you are carrying through must be in something that can be resealed, which rules out a takeaway coffee cup or an open can.
Your return airport may not have the same rule as your departure airport. All four London airports tell passengers to check the rules at every airport on the itinerary, including the one you fly home from. A two-litre bottle that sailed through Heathrow will be confiscated at an airport that still works to 100ml.
Baby milk, formula and food
Here the law is generous, and it is the same at every UK airport whichever liquid regime applies otherwise. GOV.UK puts no quantity limit on what a baby needs to eat and drink between home and destination. The table below is the government's own list, which is more detailed than most parents realise.
| Item | Hand luggage | Condition |
|---|---|---|
| Formula milk or cow's milk | Yes | The baby must be with you |
| Soya milk for babies | Yes | The baby must be with you |
| Sterilised water for the baby | Yes | The baby must be with you |
| Baby food | Yes | The baby must be with you |
| Expressed breast milk | Yes, up to 2,000ml per container | No baby required; liquid only, never frozen |
| Cooling gel packs and ice packs | Yes | Allowed in hand and hold luggage |
Two lines in it are easy to miss. A parent flying without the baby may still bring expressed milk home, in two-litre containers. And milk that has been frozen cannot travel in the cabin under any circumstances; it has to go in the hold, which for most families is an argument against freezing it at all.
Expect every bottle and pot to go through the scanner on its own, and expect to be asked to unscrew a lid. What you will not be asked to do is decant anything: Heathrow confirms that these items stay in the hand baggage and need no separate liquids bag. Our guide to travelling in London with a baby covers the same rules from the other end of the trip.
If you would rather not carry it, Gatwick lets you pre-order up to two tubs of baby milk from Boots for collection after security in either terminal, with orders placed at least seven working days before the flight. The shops usually have stock on the day as well, along with nappies, wipes and baby food, and there is a Well Pharmacy in the North Terminal after security.
Any Gatwick restaurant will warm a bottle for you. The airport says its restaurants in both terminals will heat baby bottles before your flight, which saves carrying hot water through security or buying an expensive travel warmer.
Getting a pushchair through security
Pushchairs, car seats and baby carriers all have to be screened, and a pushchair normally has to be folded to go through. That is the moment the whole thing falls apart for most families: the child is out, the bags are on the belt, and the buggy will not collapse one-handed. Practise the fold before you travel and know where the catch is.
A child who can walk unaided usually goes through the scanner on their own. If they cannot walk, you carry them through with you. Every item a child is carrying is screened too, including soft toys, and Gatwick's advice is worth taking: tell children beforehand that the teddy has to go through the machine, so that being separated from it is not a shock at the belt.
Gatwick runs dedicated Assisted Travel and family lanes at security, signposted after check-in, which give families more time and space. Heathrow suggests allowing extra time rather than promising a faster route, and sells Fast Track for families who want a shorter queue. Where those lanes sit is covered in our guide to Gatwick's North and South terminals.
Most airlines let you keep the pushchair through the terminal and take it to the aircraft door, where it goes into the hold. Whether you get it back at the aircraft or at baggage reclaim depends on the airline, not on the airport, so ask at check-in rather than guessing. Arriving at a foreign airport at midnight to find the buggy is on the carousel and the carousel is twenty minutes away is a bad surprise.
The border on the way home
Until July 2026, a family returning to the UK with primary-school-age children had to queue at a staffed desk, because eGates were closed to under-12s. That changed: the Border Force guide now puts the minimum age at eight, provided the child is at least 120cm tall and holds a biometric passport. Children aged 8 to 17 must go through with an adult.
The other conditions have not moved. Border Force restricts the gates to British and Irish passports and to a published list of other nationalities, which takes in the EU countries, the United States, Canada, Australia, Japan and several more; check that list before you rely on it. Everyone also needs valid status, which for most visitors is a UK Electronic Travel Authorisation. What the ETA is and who has to buy one is covered separately.
One rule trips up European families in particular. A national identity card will not get anyone into Britain, apart from a few narrow categories, and it is useless at the eGates. Every child needs a passport of their own.
A child under eight still goes to a staffed desk, and in practice the rest of the family goes with them, because nobody wants to split up at a border. If your children sit either side of the age line, plan for the slower queue.
Where to put children before the flight
Every Heathrow terminal keeps a Stay & Play space beyond security, free, running 06:00 to 21:00, with soft play graded by age and chairs for the adults. Nobody supervises it, so one parent stays. Gatwick does the same thing under the name Kids Zone, one in each departure lounge, also at no charge.
A paid lounge is the alternative, and for a family it is rarely the economical one. The only London lounge with a children's area of its own starts at £40 an adult, and the cheapest room at Gatwick is £28. Two adults and two children comfortably clears £100, against nothing for the play space fifty metres away. What a London airport lounge costs has the full list.
Heathrow runs a Kids Eat Free offer during school holidays: a child eats free when an adult buys a main meal at a participating restaurant. Terminal 4 has a viewing area after security with wide views across the airfield, and Terminal 5's satellite gates are another good place to watch aircraft, which costs nothing and reliably fills twenty minutes.
Changing, feeding and the awkward bits
Every Heathrow terminal has baby changing both before and after security, usually beside the main toilets, with family toilets and larger washrooms in some areas that give room for a buggy. Breastfeeding and bottle feeding are welcome anywhere in the terminals, and Heathrow points to quieter corners with seating if you want privacy. Gatwick's arrangements are similar.
Free luggage trolleys are available in the Heathrow car parks and on the terminal forecourts, which matters more than it sounds when one adult is pushing a buggy and the other has three cases. If you have a long gap between arriving in London and flying out, our guide to left luggage in London is worth reading before you commit to dragging everything round.
Early flights, late flights and where to sleep
Budget flights from Stansted and Luton often leave before 07:00, which with children means either a night journey or a night near the airport. The transport runs: the Luton DART operates 24 hours a day and Thameslink trains run through the night from Gatwick. Whether a four-year-old should be on one of them at 03:00 is a different question.
Our comparison of overnight and early-morning airport transport shows what actually runs at each airport after dark, and the airport hotel options are compared separately. For a family, the hotel usually wins: everyone sleeps, and the walk to check-in takes ten minutes instead of two hours.
One saving is worth knowing if you are going out to Heathrow by train. The Heathrow Express carries under-16s at no charge alongside a paying adult, so for two parents and two school-age children it can undercut the Elizabeth line, where anyone over ten pays a fare. Our comparison of the two Heathrow trains does the sums, and step-free routes with a pushchair covers the walk to the platform.
A realistic timeline for a family departure
| Step | What to allow |
|---|---|
| Arriving at the terminal | Follow your airline's advice, then add 30 minutes for every small child |
| Bag drop | Longer than the app suggests if the pushchair needs a tag |
| Security | 15 to 40 minutes; use the family lane at Gatwick |
| Feeding and changing | 20 minutes, and do it before you sit down anywhere |
| Play area or plane spotting | Whatever is left, up to about an hour before boarding |
The one thing not to economise on is the gap between the last feed and boarding. An hour spent in a play area is an hour not spent on the aircraft, and children who have run about before a flight are easier company on it. For the days before the flight, see our family guide to the city.
Frequently asked questions
Can I take baby milk through security at a London airport?
Yes. GOV.UK allows enough baby food, formula, cow's milk and sterilised water for the journey with no legal limit on quantity, at any UK airport. The baby has to be travelling with you for those items. Each container is screened separately and staff may ask to open one.
Can children use the eGates at UK airports?
Children aged eight and over can, if they hold a biometric passport, are at least 120cm tall and hold a nationality the eGates accept. Anyone aged 8 to 17 must be accompanied by an adult. Children under eight still go to a staffed desk, so a family with a younger child will queue.
Do I still need to put liquids in a small plastic bag?
Not at Heathrow, Gatwick, Luton or Stansted, all of which now let liquids stay in the hand luggage. The size limit differs: Heathrow and Gatwick allow containers up to two litres, while Stansted and Luton still work to 100ml. Check the rules for your return airport too.
Is there a free play area at London airports?
Heathrow has a free Stay & Play area after security in every terminal, open 06:00 to 21:00 and unsupervised. Gatwick has free Kids Zones in both departure lounges. Both are cheaper than a lounge and often better suited to small children.
Will my pushchair be returned at the aircraft door?
That depends on your airline, not on the airport. Most airlines let you use the pushchair up to the aircraft door, after which it goes into the hold, but some hand it back at the door on arrival and others send it to baggage reclaim. Ask at check-in.
Sources
- GOV.UK - Hand luggage restrictions: baby food and baby milk (checked September 2026)
- GOV.UK - Hand luggage restrictions: liquids (checked September 2026)
- Border Force - Faster travel through the UK border (checked September 2026)
- Heathrow - Travelling with children (checked September 2026)
- Heathrow - Security and baggage (checked September 2026)
- London Gatwick - Travelling with children (checked September 2026)
- London Gatwick - Security screening (checked September 2026)
- London Stansted Airport - Security screening (checked September 2026)