Jessica Ennis-Hill
Ennis-Hill celebrates first major success since London 2012.Getty

Jessica Ennis-Hill has won heptathlon gold at the World Athletics Championships in Beijing.

Ennis-Hill, competing in her first major competition since London 2012 after the birth of her child, sealed her victory with another impressive performance in the 800m heat with a time of two minutes and 10.13 seconds.

Having already built a formidable lead in the first six events, the 29-year-old's performance in the final event gave her an unassailable lead, leaving Brianne Theisen-Eaton trailing 115 points down in silver and Laura Ikauniece-Admidina 38 points further back.

Fellow Brit Katarina Johnson-Thompson sat in second place heading into the final day of the event but finished fifth after a series of errors in the long jump.

Ennis-Hill only announced her decision to feature in the world championships in July, following her appearance at the Anniversary Games in London.

"I am lost for words, coming back here to the Bird's Nest. This time last year I was having my son and now I am world champion, it's an incredible feeling," Ennis-Hill told the BBC.

"It was a massive surprise to be here. Obviously having done the Anniversary Games, I had to make the decision if I was ready to come here and be competitive. Now to be here and to finish on top... I am just really lost for words.

"Before the Anniversary Games, I was not sure whether I was going to be ready. But, having performed in London and put some good times in and good jumps in the long jump, I felt I was making progress and getting to where I needed to be."

Ennis-Hill's gold follows Mo Farah's 10,000m success on Saturday 22 August.