Sorry Barb...didn't mean for the original post to be confusing.

Basically, every paying adult travelling within Australia is given a 20kg luggage allowance. If you have a child under the age of 2 travelling with you (not taking up their own seat), then you are able to trade in 5kgs of your own luggage allowance in order to take WHATEVER you need for the baby. Although you have traded in 5kgs of your own luggage allowance; this figure has no correspondance to what weight of items you bring for bubs. You can take any number of baby items such as prams, portacots, high chairs, strollers, car seats etc.

For example, Maddy and I flew to Sydney last week. As a paying adult I was entitled to a carry-on cabin bag and a 20kg allowance for a suitcase in baggage. As I was bringing Maddy; I limited my own suitcase to below 15kgs and therefore could bring Maddy's pram and a backpack for her. I was also allowed another carry-on cabin bag/change bag for Maddy for free.

Hope that makes sense!