A female giant panda cub weighing 270.4 grams became the world's heaviest captive panda newborn on record, a panda research center in southwest China's Sichuan Province said on Wednesday. Cuicui, a 16-year-old giant panda, gave birth to the cub at the Wolong Shenshuping panda base at 9:39 p.m. on August 5, breaking the previous birth weight record of 249 grams held by a panda born in 2021, according to the China Conservation and Research Center for Giant Panda.