Notify the TSA Officer
Formula, breast milk and juice for infants or toddlers are permitted through the security checkpoint. Separate formula, breast milk and juice from other liquids, gels and aerosols limited to 3.4 ounces or 100 milliliters.
Inform the TSA officer at the beginning of the screening process that you carry formula, breast milk and juice in excess of 3.4 ounces in your carry-on bag. These liquids are typically screened by X-ray.
Screening Formula, Breast Milk and Juice
TSA officers may test liquids for explosives or concealed prohibited items. If officers are unable to use X-ray to clear these items, they may ask to open the container and have you transfer the liquid to a separate empty container or dispose of a small quantity of liquid, if feasible.
Inform the TSA officer if you do not want the formula, breast milk and/or juice to be X-rayed or opened. Additional steps will be taken to clear the liquid and you or the traveling guardian will undergo additional screening procedures, to include a pat-down and screening of other carry-on property.
The Food and Drug Administration states that there are no known adverse effects from eating food, drinking beverages and using medicine screened by X-ray.
3-1-1 Liquids Rule Exemption
Formula, breast milk and juice in quantities greater than 3.4 ounces or 100 milliliters are allowed in carry-on baggage and do need to not fit within a quart-sized bag. Separate formula, breast milk and juice from other liquids, gels and aerosols limited to 3.4 ounces.
Ice packs, freezer packs, frozen gel packs and other accessories required to cool formula, breast milk and juice are allowed in carry-on. If these accesories are partially frozen or slushy, they are subject to the same screening as described above. You may also bring gel or liquid-filled teethers, canned, jarred and processed baby food in carry-on baggage. These items may be subject to additional screening.
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You can find this information and more details on traveling with children on the official website of the Department of Homeland Security: http://www.tsa.gov/travel/special-procedures/traveling-children