Holiday list for 9 month old and hot water flask!

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We are going on holiday soon to a warmer country, and the flight will be approx 6 hours.
Packing essentials for a 9 month old please?

Top tips with regards to packing milk/food etc?

Also I have a tommee tippee flask for hot water to warm up his bottles and food - am I allowed to bring this through airport security?

A sling for going through security and if they get restless on the flight.

Yes you are allowed sterilised water in a flask. When travelling with a baby you’re allowed to take enough baby food, sterilised water, prepared baby milk and expressed breast milk (up to 2 litres) for the journey.

But if I were you I’d leave the flask. You can get hot water and bottles warmed at the airport after security. I’ve never known a cafe refuse me hot water for my dc, and I’ve never been on a flight where they’ve refused to warm bottles.