Ok ladies. I have been there done that..

Took DS when he was 5.5 weeks, 6 months, 12months 2 years and 2.5 years coming up
And DD at 6weeks and soon 6 months.

My tips

1. Lots of snacks.. lollies anything exciting and NEW for them.
2. 2$ shop toys.. Dont bring too many either 2-3 things.. they get over them so quick and prefer to play with the head phones on the plane.
3.2 Changes of clothes.
4. i would say 8 nappies.. you dont need anymore as they dont go anymore then they wouldn normally and you dont want to be packing too much stuff.
5. A stroller like a umbrella cheap ligth stroller.. if you are flying Qantas they supply them.. brilliant.
6. I would take Phenegran wiht you just incase.. I have used it twice on the plane. When you have tried EVERYTHING and they are overtired.... Then what have you got up your sleeve?
7. Book a basinette on the plane.. up until 1.5 years they can go in it.. brilliant as you dont have to hold the baby while sleeping..and they are fastastic beds.
8.Put baby in something warmish on the plane as its normaly cold on them..
9. None of my kids have sucked on anything while taking off and landing.. and never had ear problems at all.

What times do your flights leave australia/