Hi Shu,
I've travelled heaps with my LO who is now 18MO. First trip we did was when he was 4MO and since he's been on about 7 flights including two really long haul (New Zealand to England - 25 hours on a plane!).
Best advice I was given about take off and landing was to feed (eith BF or Bottle - whatever you are comfortable with). This helps the ear canal stay open and reduces the pain. Also if they cry - don't get too worried about it. Most people are understanding and if they aren't - they are the kind of people that don't deserve to be worried about!
Nappies, lots of wipes, cloths for wiping up any spills etc, spare change of clothes are a must. A small toy that your LO really likes (nothing too noisy!) or if they have a lovie (comfort blankie) take that.
We were able to take our pram as far as the gate where you board the plane and they then took it away but I know some airlines make you check. Depends on the airline but if you ring and ask and tell them it's your first time with baby they are normally helpful.
Good luck and feel free to ask any other questions
