The 3.4 oz liquid rule scares a lot of new parents. It doesn't apply to your baby's food.
Formula, breast milk, toddler drinks, and baby food are all medically necessary liquids as far as the TSA is concerned. You can bring them over 3.4 oz, and they don't have to fit in your quart-sized bag. Bring what you need for the trip. We've each walked through security with way more than a quart of milk and never had a problem.
What TSA actually lets you bring
In your carry-on, in any amount:
- Formula and breast milk
- Water or juice to mix with formula
- Pureed baby food and pouches
- Ice packs, freezer packs, and gel packs to keep it all cold — even if there's no milk in the bag yet
- Breast pump and pumping equipment
One thing that surprises people: your baby doesn't have to be with you. If you're traveling to pump, or flying ahead of your family, you can still carry breast milk through security.
How the screening works
Tell the officer at the start that you're carrying formula or breast milk over 3.4 oz. Pull those items out of your bag so they can be screened separately, the same way you'd pull out a laptop.
Most of the time they'll run it through the X-ray or test it, and you're done. If you'd rather they not open or X-ray the milk, say so — they'll do additional screening of you and your other bags instead. Either way, it's allowed.
Build in a few extra minutes for this. The one time it slowed us down was juggling a baby on one hip while fishing bottles out of the bottom of the bag. Have your milk ready before you're at the front of the line.
Pack it so you're not digging
The whole thing goes faster when your liquids aren't buried. We keep all the bottles, pumped milk, and pouches together in the Crown Carryall's insulated pouch — when we hit security, we lift out one pouch instead of unpacking the whole bag. Drop in a frozen gel pack and it doubles as the cooler for the day.
A few more things that help:
- Label pumped milk bags with a marker if you've got multiple
- Bring a little extra — delays happen, and you don't want to run short at the gate
- Pre-mix or pre-portion formula so you're not measuring at the checkpoint
That's it. The rules are on your side here — you just have to speak up at the start and keep your milk easy to grab.
Flying soon? Our first-flight no-panic guide covers the rest of the airport.
— Holly + Caroline 👑
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