When you're travelling, continue to give your baby their usual formula. However, it's best to use bottled water instead of tap water to make a feed.
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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.
if travelling with your baby you can take enough expressed breast milk, formula milk, sterilised water and/or baby food required for the journey. There is no legal limit to how much you can take however check with the airport before you travel.
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.