Seoul, South Korea (CNN) -- British Prime Minister David Cameron joked that he had an ulterior motive for attending the G-20 summit in South Korea: to catch up on sleep after the birth of his daughter, now 3 months old.
"Everyone else has come to Korea for a summit or a business meeting. I've come just for a good night's sleep," Cameron told world leaders at the business summit.
After the joke Thursday, Cameron gave a serious speech about creating a "stable global economy."
Before going to Seoul for the summit, Cameron went to China for the first time since becoming prime minister.
Cameron and a contingent of ministers and business leaders went to Beijing on Tuesday as part of a tour to boost bilateral trade with the world's second-largest economy.
During a speech in Beijing on Wednesday, Cameron cautiously urged China to allow greater political freedom at home and play a more constructive role in international affairs.