Traveling first time with baby

Hi ladies I will be going back to my home country for holiday in 2 weeks with baby who will be 6 months than and fiancé and it’s my first time flying with baby so I’m wondering if you have any advice how to make this experience easier :D

Also We will be going for 2 weeks and the milk I feed my baby with is not in my country so I don’t know if I should buy the milk and bring it with me or try a different milk company that is in my country. We will only have one 20kg luggage and 3 Carry on back packs so I’m scared we will not fit everything we need to take if we take the milk with us.

Thank you 😊