A first flight with a baby produces more anticipatory anxiety than the flight itself usually justifies. Babies up to 4 to 6 months are often the easiest age to fly with — they sleep, they feed, they don't yet have an opinion about being in a seat. Walking, opinionated 18-month-olds are harder. The preparation, though, is the same: practical packing, the right paperwork, a realistic plan for ear pressure, and a willingness to feed on demand.
Healthbooq covers travel and family life through the early years.
Age, Paperwork, and Medical Clearance
Healthy term babies: most airlines accept from 2 weeks of age. A few (Ryanair, easyJet) accept from 7 to 8 days; some long-haul carriers require 14 days. Always check the specific airline before booking, especially with a young baby.
Premature babies: usually need a GP or paediatrician letter, and a typical guideline is to wait until around 37 weeks corrected gestational age before flying. Reduced cabin oxygen levels can be a problem for very small or unwell babies. The neonatal team will guide you. Some airlines will request a "Fit to Fly" certificate; this is more common with very young babies.
Babies who've recently been unwell (especially anything affecting breathing or oxygen levels): worth asking your GP whether to delay.
A few practical paperwork notes:- The baby needs their own passport, even at 2 weeks
- For international travel, both parents (or the travelling parent if travelling without the other) sometimes need a notarised consent letter — varies by destination
- Check vaccinations for the destination — some areas (yellow fever, certain travel zones) have specific requirements
Lap Infant or Their Own Seat?
Children under 2 fly as a "lap infant":
- Free on most UK domestic flights
- Roughly 10% of the adult fare on international routes, with airport taxes typically still payable
- No seat of their own; they sit on a parent's lap with a small infant seat-belt loop fastened around them, attached to the parent's belt
- Not the safest option in turbulence — most aviation safety bodies recommend a separate seat with a child restraint where practical
When a separate seat is worth paying for:
- Long-haul flights (4+ hours) — better sleep, two free hands, much less back pain for you
- The 18 to 24 month range — at this point even a free lap seat is uncomfortable for both of you
- For families wanting maximum safety in turbulence
What car seat works on a plane:
The seat needs an approval label. In the US: an FAA "Approved for Use in Aircraft" sticker. In Europe: a TÜV or similar marking. In the UK: airlines vary; check the specific airline's approved list before assuming. The seat must fit on the plane seat (which is narrower than a car seat) — typically 42 cm or less in width.
A CARES harness (Child Aviation Restraint System) is an alternative for children 1 to 4 years old (10 to 20 kg) — much smaller than a car seat to carry, attaches to the plane seat with a strap. FAA-approved; accepted by many but not all UK and European airlines, so check.
Bassinets on Long-Haul
Most long-haul aircraft have bassinet positions at bulkhead rows. They:
- Attach to the wall in front of the bulkhead
- Are available for babies typically under 6 months and under 10 to 11 kg (varies)
- Are first-come, first-served in most airlines — not guaranteed at booking
- Are usually allocated 24 to 48 hours before departure
If you're flying long-haul with a baby under 6 months, request the bassinet seat at booking, then call the airline 1 to 2 days before to reconfirm. The space saved by not holding a sleeping baby for 8 hours is enormous.
A baby in a bassinet has to be removed during turbulence — the cabin crew will ask you to lift them out. Plan for this.
Ear Discomfort: What Actually Helps
Cabin pressure is regulated but not to sea-level — typically equivalent to 1,800 to 2,400 metres altitude. Babies experience pressure changes most acutely during descent, when the cabin pressure rises faster than ascent.
Babies can't yawn or swallow on demand, but sucking and swallowing equalise the Eustachian tube.
What works:
- Breast or bottle feed during descent — start as the plane begins descending (you'll hear engine note change; cabin crew are usually happy to give you a heads-up). Saving a feed for this moment is the single highest-yield trick in this guide.
- A dummy if the baby uses one
- For older babies eating finger foods: a snack to chew during descent
What doesn't help:
- Decongestants for healthy ears — no good evidence; not recommended for under-6s
- Trying to anticipate ascent in advance — most babies tolerate ascent fine
Avoid flying with an active ear infection if you possibly can. The pressure differential across an inflamed eardrum can be severe and occasionally causes a perforation. If unavoidable: paracetamol 30 to 60 minutes before takeoff, saline nasal drops to reduce upper-airway congestion, and feeding through ascent and descent. Discuss with your GP.
Pre-Flight Day
A few logistics that smooth the day:
- Online check-in the day before; saves queueing with a baby
- Family security lanes at most major airports — ask if you don't see signage
- Buggies/strollers can usually be taken right to the gate and reclaimed planeside — it's the only way to get a small child through a long airport without losing your back. The buggy gets a "gate-tag" at check-in.
- Pre-board — most airlines will board families with infants first. Some have stopped doing this; check.
- Liquids over 100 ml are allowed for babies — formula, breast milk, baby food. Tell security at the start of the X-ray queue. They may need to test the bottle.
What to Pack in the Carry-On
The "double what you think" principle applies harder here than for toddlers, because the consequences of nappy/feed shortage in flight are higher.
For all babies:- Nappies — at least 1 per hour of expected travel time, plus 4 spares
- Wipes (more than you'd think; everything ends up wiped)
- Two complete changes of clothes for the baby — blowouts at altitude are real
- One spare top for you — milk, vomit, leak
- A muslin — bib, mop, privacy screen, blanket, pillow
- Bibs
- Disposable changing mat or one washable one in a bag
- A muslin or breastfeeding cover if you want one (most other passengers do not care)
- A water bottle for you — feeding is dehydrating
- Pre-measured formula scoops in pots
- Empty sterilised bottles
- A small flask of cooled, boiled water (bring through security after checking; some airports test it)
- Cabin crew will fill bottles with hot water for you on most airlines
- Pouches and spoons (security accepts pouches even over 100 ml)
- A few jars or pots of food
- Snacks
- Paracetamol for the baby (Calpol or equivalent)
- Saline nasal drops
- Comfort item — small soft toy, comforter
- Dummies if used (bring two; one will end up on the floor)
- Phone charger
- Small first aid kit basics
Flight Timing for Babies
The "fly during their nap" advice is more useful for toddlers than babies — most healthy babies under 6 months sleep on planes regardless. Practical preferences:
- Avoid flights that depart at 4 am — you'll be more wrecked than the baby
- Long-haul overnight with a bassinet is often the easiest configuration for a young baby
- Connections add complexity disproportionately — direct beats short-plus-short with most babies
In-Flight Practicalities
Changing nappies on a plane: the changing tables in the bathroom are tiny (the size of a tray). Some larger aircraft have dedicated parent rooms. The hardest age is around 6 to 9 months when the baby is mobile but not yet patient. Pack a portable changing mat that opens out wide enough to hold an active baby; do the change quickly.
Feeding: breast or bottle on demand. There is no "feeding schedule" you need to maintain on a plane. Cabin crew are usually friendly about warming bottles.
Crying: most flights have a crying baby. Most other passengers know this. Walk to the back of the plane if you want a change of scene; cabin crew often have a small clear space near the galley.
Cabin air is dry — feed more often than usual to keep the baby hydrated.
After Landing
Jet lag in babies and toddlers is real. Across more than 4 time zones, expect 3 to 7 days of disrupted sleep. The fastest reset is daylight exposure on the new schedule:
- Get outside in morning daylight at the destination
- Try not to nap into the early evening — keep the bedtime within 1 to 2 hours of the destination's normal time
- Resume routine elements that travel well — bath, story, feed, dim lights, sleep — even if the timing is off
Hydration for the first 24 hours — flying is dehydrating, and small bodies feel it more.
Don't be alarmed by a few rough nights. This is normal and resolves.
When Not to Fly
- Babies under 2 weeks without specific clearance
- Premature babies before clearance from the neonatal team
- Active ear infection (postpone if possible)
- Recent middle-ear surgery including grommets — usually fine to fly within days, but check with the ENT team
- Acute respiratory illness with reduced oxygen saturation — discuss with GP
- Severe heart conditions — case-by-case with cardiology
For everyone else, healthy travel is fine. The first flight is the worst-anticipated and usually one of the better-executed ones — you do all the preparation properly because you're nervous. By the third flight, you'll be packing in 20 minutes and doing it on autopilot.
Key Takeaways
Most airlines accept healthy term babies from 2 weeks (some 7 days, some 4 weeks); premature babies usually need a GP or paediatrician letter and may need to wait until around 37 weeks corrected gestational age. Under-2s fly as lap infants — free on domestic, around 10% of fare on international, no seat-belt of their own. For long-haul, paying for a seat and bringing an aviation-approved car seat (look for the 'For Use in Aircraft' label) is genuinely safer in turbulence. Bassinets at bulkhead rows are first-come on most long-haul, weight and length limited (commonly under 10–11 kg), and worth requesting. The single highest-yield trick for ear pain on descent: feed or offer a dummy as the plane starts coming down, not before. Don't fly with an active ear infection if you can avoid it.
