Can I take baby formula from the UK to the USA?
Yes — baby formula is exempt from the 100ml rule on both sides when travelling with an infant.
UK and US security allow 'reasonable quantities' of formula, expressed milk and baby food in cabin baggage, even if individual containers exceed 100ml. Declare it separately at the checkpoint — it may be tested.
The exemption applies only when the baby or toddler is travelling with you. Without the child present, formula goes through the standard 100ml rule.
Triple check before you pack
Airport security, airline baggage rules, and destination border rules are three different checks. Passing one does not guarantee passing the others.
Check the airport security rule for baby formula before you fly.
Check airline and baggage rules for baby formula on this route.
Check the USA import rules for baby formula.
Cabin — exempt with the child present
Both the UK Department for Transport and TSA allow formula, breast milk, expressed milk, juice and baby food in 'reasonable quantities for the journey'. Containers can exceed 100ml. Declare them at the start of screening and remove from your bag. Liquids may be tested with a chemical detection strip — they are not opened or tasted.
Checked — no restriction
Sealed cartons and tubs of formula travel without issue in checked luggage. Pack in a leak-proof bag in case of pressure changes.
US customs — commercial formula is fine for personal use
Commercially-sealed infant formula for personal use is permitted into the US. The FDA does not restrict personal-use quantities. Avoid raw/unpasteurised dairy and homemade preparations — these can be questioned at the border.
Common mistakes
- Not declaring formula at the start of security — it will be flagged in the X-ray and slow you down.
- Bringing formula in cabin when the baby isn't travelling — the exemption no longer applies.
- Carrying enormous quantities 'for the holiday' — security may challenge anything beyond what's reasonable for the flight and immediate connection.
- Mixing powdered formula into bottles before security and finding the prepared liquid still gets tested.
Pre-flight checklist
- Bring only what's reasonable for the flight + connection
- Tell security at the start: 'I have baby liquids'
- Remove formula/milk from your bag before the X-ray
- Baby or toddler is travelling with you
- Commercially-sealed formula in original packaging where possible
- Extra cooler bag for expressed milk on long-haul
Official sources
- UKGOV.UK — Hand luggage restrictions
- USTSA — Traveling with children (formula, breast milk)
- USFDA — Personal importation of medicines and food
Last reviewed May 26, 2026. Rules can change at short notice. Airport security staff and customs officers have final discretion at the checkpoint or border.
Frequently asked questions
How much baby formula can I take in cabin?
A 'reasonable quantity' for your journey. Both UK DfT and TSA leave this to officer discretion. Bring what the child will need for the flight and immediate onward travel; pack the rest in checked.
Will my breast milk be opened at security?
No — it's screened by chemical detection strip or bottle scanner. Containers stay sealed. If a strip alarms, you may be asked for a manual inspection.
Can I take formula in cabin without my baby?
No. The exemption requires the infant or toddler to be travelling. Without the child, formula goes through the standard 100ml rule.
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Related corridor guides
LiquidLimits.com is a travel planning tool, not an official airport or government source. Rules can change between trips and between terminals. Always check the official airport or aviation security guidance before you travel, and when in doubt pack to the stricter 100ml cabin-bag rule.