Carriage of a Pram/Stroller is at no additional charge and is not included in your checked luggage allowance.
Qantas:
Children and Infants - Travel Information
Baggage
Children are entitled to the same baggage allowance as adults.
Infants have the following baggage allowances:
- Australian Domestic, Dash 8 and Fokker flights - No allowance
- Travel to and from US Territories, Tahiti, South America and Canada^ via the Pacific - 1 piece with total dimensions not exceeding 115cm (45in)
- New Zealand Domestic and all other International ^ - 10kg (22lb)
Adults accompanying infants are entitled to check-in one collapsible stroller or a carry basket or bassinet (to be stowed in the aircraft hold) and infant food and nappies for use inflight.
This is in addition to the normal free baggage allowance for adults.
Jetstar:
Baggage
In addition to the allowance Jetstar will carry at no additional charge in the hold baby accessories such as a pram and portable cot, if you are travelling with an infant.