Sir Chris Hoy shows off picture of baby son SIR Chris Hoy has shown off a picture of his baby son Callum and told his family and friends he says "Hi." The six-time Olympic champion became a dad for the first time when his wife Sarra gave birth to Callum last month. And he delighted his Twitter followers on Thursday by uploading a snap of Callum, who was born 11 weeks premature, in his hospital bed. Sir Chris wrote: "Thanks for all your messages for Callum. He's doing well so far and says hi! Wellwishers sent message of congratulations and encouragement to the star and his family. Jude wrote: "Aw what a cutie! Gorgeous lil lad, keep going Callum! You've work to do at home...stopping mum n dad sleeping! Best wishes guys. Lynda Williams said: "Great news. My sons were 9 & 8 weeks prem and are both healthy 8 and 6 year olds now. Hopefully you'll have him home soon. Sir Chris had taken to Twitter to confirm the birth of his "beautiful baby son" on October 15 and admitted he was "a little shocked" with the early arrival who was born 11 weeks early. He said: "Amazed, delighted & a little shocked to announce the birth of our beautiful baby son, Callum David Robert Hoy! Born at 29weeks, today at 2pm. The 38-year-old sportsman had also shared an adorable snap of Callum's tiny hand clutching his finger and alongside it he wrote: "Although v. early days for wee Callum, he's doing well as is Sarra. Huge thanks to incredible medical staff. Fellow Olympic gold-medallist Rebecca Adlington was one of the first well-wishers in the wake of the happy news. She tweeted: "congratulations to you both! Hope Sarra is going well as well as baby Callum! Xx Sir Chris married lawyer Sarra in 2010 and announced they were expecting their first child on June 25. The sporting pro recently spoke of his excitement about becoming a father for the first time. He said: "I think maybe I'm just blindly optimistic that it's going to be great fun and dead easy. I'm sure it won't be, I'm sure there'll be lots of tough things but I'm just very excited. It all seems to have happened at the right time. Since retiring from cycling last year, the star has taken up motorsport with plans to compete at the 24-hour Le Mans race in 2016. He has also started his own bicycle company and is acting as an ambassador with various charities including the Royal Air Force Air Cadets.