"I want presents!" the teen said. All participants got to keep their hoodies.
The record was set in 15 minutes, 29 seconds.
Guinness representative Fortuna Burke certified the feat, counting on a clicker as children filed onto an outdoor verandah at Siam Paragon mall, the event's organizer. Once in place, the children waved as a drone flew overhead to capture aerial images.
Although Christmas does not appear on Thai calendars and is a regular workday, hotels and shopping malls decorate starting in mid-November for what is a big shopping season during Thailand's peak tourism months.
Thais also set other off-beat records this year. On Valentine's Day, a couple set a record for longest kiss (58 hours, 35 minutes and 58 seconds). Also in February, nearly 4,483 people swung hula hoops for seven minutes, a record for the most people dancing with hula hoops simultaneously in one place.
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Associated Press writer Thanyarat Doksone contributed to this report.