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. These items should be separated 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 your carry-on. If these accessories 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.