Just saw this in the news. Great for parents travelling with young infants.
But other than the 7kg cabin allowance and complimentary carriage of prams, car seats and strollers, these young jetsetters could never check in their own Samsonite and had to share (or hog) Mum and Dad’s baggage allowance. But Zac George in Points From The Pacific says that’s changing as Virgin Australia will now allow 23 kg of checked-in luggage plus 7kg of cabin bags plus prams and car seats for these small children
regardless of fare type or class of travel(except Economy Lite fare) Small children aged twenty-three months or younger already travel for free on Virgin’s domestic flights if they do not occupy a seat. Infants jetting off internationally pay 10% of the fare excluding fees, taxes and ancillary charges.
Update Nov 2021:
Infants and children are entitled to carry special items as checked baggage, free of charge, as listed below. If you're travelling with an infant, you may check in a 23kg bag as part of your special item baggage allowance (except where you are flying on an Economy Lite fare).
Under 2 years of course. "under 23 months" makes no sense.