Mother and baby are both in good condition in a local hospital in Xinxiang city, Henan province.
The arrival was auspiciously timed, just after the start of the lunar New Year, the Year of the Dragon.
s delighted father told local TV: 'My wife was not different from other pregnant women. She ate and drank normally as she should. But she's given birth to such a big, fat son.
'Today is the first day of spring in the Chinese calendar and he's a 'dragon baby'. I feel very happy," his father Han Jingang told local broadcaster Xinxiang Television.
His 29-year-old mother, Wang Yujuan, said she had sensed something special.
'I clearly felt that my body was clumsier than when I had been pregnant with my daughter. 'My belly was bigger than it was then. I guessed the baby would be between 4.5and 5kgs. I never expected to hear that he weighs 7kgs,' she said.
The couple's six-year-old daughter weighed just over 4kgs (8lbs) birth.'This baby is twice as heavy as a normal one,' Shang Lili, head of the obstetrics department told Xinxiang TV.
Between 2008 and 2010, three babies weighing exactly 7kgs were born in China, and at the time jointly held the record for being the country's heaviest babies.
At 7.04kgs, Chun Chun just tips the scales over the reported record in China.
The heaviest baby on record weighed 10.8kgs (23lbs) when born in Ohio in 1879, according to the official website of Guinness World Record, but died shortly after.