TSA officers may need to test the liquids for explosives or concealed prohibited items. Although not required, to expedite the screening process, it is recommended that formula and breast milk be transported in clear, translucent bottles and not plastic bags or pouches.

In 2026, traveling with baby formula is regulated under the "medically necessary liquids" exception. Unlike standard liquids, you can carry formula in quantities exceeding 3.4 ounces (100ml) in your carry-on bag. It does not need to fit in a quart-sized zip-lock bag. At the security checkpoint, you must notify the TSA officer that you are carrying formula; they will likely screen it separately using X-rays or a vapor test. To make the process smoother, 2026 travel experts recommend using clear, translucent bottles and pre-measuring powder into stackable dispensers to avoid scooping on a moving plane. While you can bring "ready-to-feed" liquid, many parents prefer bringing empty sterilized bottles and buying bottled water post-security to mix with powder during the flight. Always pack more than you think you need for the duration of the trip to account for unexpected flight delays or cancellations.