Duke and Duchess of Cambridge
Britain's Catherine, Duchess of Cambridge, and her husband Prince William watch as their son Prince George looks at an Australian animal called a Bilby, which has been named after the young prince, during a visit to Sydney's Taronga Zoo April 20, 2014. Reuters/David Gray

Prince William and Kate Middleton, the Duke and Duchess of Cambridge, are expecting their second baby in April 2015, a statement from the royal family said Monday. In September, Clarence House had announced the 32-year-old duchess' second pregnancy.

The statement also revealed that Middleton is still suffering from hyperemesis gravidarum, an acute form of morning sickness, but her condition is steadily improving. The duchess had suffered from a similar condition when she gave birth to her first child, Prince George, in 2012.

Middleton will also resume her royal duties when she greets Tony Tan, Singapore's president, on behalf of the Queen, at London's Royal Garden Hotel on Tuesday, Clarence House said, in a statement. The Duchess of Cambridge will also attend an awards ceremony for Wildlife Photographer of The Year 2014 at the Natural History Museum.

Meanwhile, there have been reports that the royal couple's second child will be a girl, while some reports have speculated that the duchess is expecting twins.