Olympic 5000m and 10,000m finalist Jo Pavey will miss this year's IAAF World Championships with the announcement that she is expecting her second child in September 2013.
Pavey, who was the first European finisher in both races at the London Olympic Games had a memorable year when she also won a silver medal at the Helsinki European Championships.
"We are so thrilled and happy. It's going to be so lovely to have a little brother or sister for Jacob. Jacob has been so much fun and we always wanted more children," said Pavey.
"However I fully intend to carry on and my aim is to make the team again in 2016 for the Olympic Games in Rio. It will be very special if I can make those Games. I'll be getting older, but I have been very encouraged to continue after running a PB in the 10,000 in London.
"Not many long distance runners make four Olympics so going for a fifth has that extra added dimension, I still want to be competitive and would not be aiming to go just to take part. It would be a great opportunity."
Pavey now intends to set her sights on the European Championships in 2014 as her first event back, with an aim of turning her top European finish from London into a podium spot at Zurich next Summer.
British Athletics Head Coach Peter Eriksson said: "We are delighted for Jo and Gavin and will work with her to ensure she can return to competition in 2014 in great shape."