Australis is allowing children aged 17 and under to sail free on Patagonia cruises in December.

The offer enables one child 17 or under to sail free per adult on three- and four-night cruises between Ushuaia and Punta Arenas.
Australis adds that the offer is subject to availability. The offer can be booked through October or while supplies last.

(http://www.australis.com)