The first year of parenthood is stressful enough without planning a family vacation that the baby won't even remember - but if your family lives far away and can't travel to you, you often don't have a choice. If you're planning on traveling with an infant, there's a lot to think about, and not just for the plane ride. You need to prepare a lot of formula or pre-pump breast milk, diapers (especially if you have a specific brand you always use), blankets and bedding, loads of antibacterial tissues and some extra clothes for both parents and baby (and that's just in your carry-on bag). It's also wise to take other personal hygiene products because while a hotel will provide you with soap, shampoo, and everything else, an unfamiliar brand can irritate your baby's skin.
All in all, the most important thing to remember about travelling with an infant is to not forget about yourself - you might have 9000 blankets, soothers, and wipes for the baby, but if you forget your own toothbrush or a change of underwear it's not going to be a pleasant trip.