Liquids are allowed in containers of up to 100 ml or 3.4 oz. Medications, baby formula/food and breast milk, are allowed in reasonable quantities exceeding 3.4 ounces or 100 mL and they don't have to be in the zip-top bag, however, these items must be declared and inspected at the international checkpoints or at the TSA (Transportation Security Administration), for flights arriving to The United States.
For additional information, visit our Not-allowed or restricted items section for a complete list on what is and is not allowed in carry-on or in checked baggage.