If you want to warm the contents of the bottle, just ask your flight attendant to warm it up in a cup of hot water.
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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.
You can take expressed breast milk, boiled water to make up feeds or for drinking, formula powder and baby food on board. Take enough nappies and wipes, and a change of clothes for you and your child in your carry-on luggage.
To do this, you could use a travel bottle warmer. These come in various designs, including one that plugs into your car's cigarette lighter. Or take a flask of hot water and a large plastic container. Then just put the hot water from the flask into a container and dip the bottle in, with its cap on, to warm it.
Checked Bags: YesFormula, breast milk, toddler drinks, and baby/toddler food (to include puree pouches) in quantities greater than 3.4 ounces or 100 milliliters are allowed in carry-on baggage and do not need to fit within a quart-sized bag.
Water for babies is allowed in reasonable quantities in carry-on bags. Remove this item from your carry-on bag to be screened separately from the rest of your belongings.
Put some freshly boiled water in a high-quality vacuum flask, which will keep it warm for about four hours. You can then easily make a feed by adding the water and formula powder to a sterilised bottle. Do check the temperature before feeding it to your baby, by putting a few drops on the inside of your wrist.
Powder MakeupPowder-like substances greater than 12 oz. / 350 mL must be placed in a separate bin for X-ray screening. They may require additional screening and containers may need to be opened. For your convenience, we encourage you to place non-essential powders greater than 12 oz. in checked bags.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.
Products containing powdered or dry milk (baby/infant formula, baking mixes, soup mixes, drink mixes) are allowed in small quantities, if they are properly labelled.