Wolfmother has cut short its current U.S. tour after bassist/keyboardist Chris Ross' partner gave birth a month early to a son in Sydney. The band played in Pittsburgh on Friday and at the Virgin Festival in Baltimore on Saturday (Sept. 23), forcing Ross to endure a 23-hour flight back to Australia on short notice.

The turn of events has necessitated the postponement of a Virgin Records in-store today in Chicago as well as a show on Thursday in Hollywood, which will be made up on Dec. 12. A Friday appearance in San Diego will not be rescheduled; refunds are available from points of purchase. Also scrapped is a Saturday set at the Download Festival at Shoreline Amphitheatre outside San Francisco.

Wolfmother had already planned to spend October at home in Australia before resuming North American roadwork Nov. 21 in Philadelphia. That tour will be preceded by a brief European run earlier in the month.