The Spice Girls singer welcomed her second child with long-term partner Jade Jones last year, and said that the couple have been speaking about extending their family.
"Jade and I have talked and it would be lovely to have a little girl," Bunton is quoted as telling The Sun.
Bunton also suggested that she and Jones do not intend to get married soon, joking: "It took us 11 years to get engaged, so how long will it take to plan a wedding?"
The Spice Girls are rumoured to be reuniting for a one-off performance at Sunday evening's (August 12) closing ceremony for the London 2012 Olympics.
Bunton recently said that she cannot wait for her children to see the Spice Girls musical Viva Forever.
Watch the video to 'Say You'll Be There' by the Spice Girls below:
Photo gallery - The Spice Girls through the years:
Copyright: Rex Features