Also, I know you didn't ask this but most airlines also allow extra baggage and 2 items of baby e.g. cot/stroller/car seat for free. Definitely check the website for the particular airlines rules
Brilliant thank you so much ☺️
Check the airline site but everyone I've travelled with allow 'enough' for the journey and you can of course carry extra in your checkin. The 100ml rule doesn't apply to babys milk/formula and is counted on top of your regular luggage allowance Also if you're carrying just the powder, you can ask any restaurant for hot water for free at least wherever I went.