Kate, the Duchess of Cambridge walks as she visits the Kranji Commonwealth War Memorial in Singapore on Thursday, Sept. 13, 2012. Prince William says he wants to have two children with his wife, Kate. The British royal has spoken often in the past about wanting to start a family but had not given specific numbers. (AP Photo/Nicolas Asfouri, Pool)

Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, laugh during a performance by children from Rainbow Centre, a school for disabled children, in Singapore Wednesday, Sept. 11, 2012. (AP Photo/Stephen Morrison, Pool)

Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, applaud during a performance by children from Rainbow Centre, a school for disabled children, in Singapore Wednesday, Sept. 11, 2012. (AP Photo/Stephen Morrison, Pool)

Kate, the Duchess of Cambridge visits the Kranji War Memorial in Singapore on Thursday, Sept. 13, 2012. (AP Photo/Nicolas Asfouri, Pool)

Kate, the Duchess of Cambridge visits the Kranji Commonwealth War Memorial in Singapore on Thursday, Sept. 13, 2012. (AP Photo/Nicolas Asfouri, Pool)

Kate, the Duchess of Cambridge pays her respect to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Kate, the Duchess of Cambridge pays her respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Kate, the Duchess of Cambridge pays her respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Kate, the Duchess of Cambridge pays her respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Prince William and his wife Kate, the Duke and the Duchess of Cambridge arrive at the Kuala Lumpur International Airport in Sepang, Malaysia Thursday, Sept. 13, 2012. (AP Photo/Samsul Said, Poll)

Britain's Kate, the Duchess of Cambridge, tours the Cloud Forest at Singapore's Gardens by the Bay Wednesday, Sept. 12, 2012 in Singapore during Prince William, the Duke of Cambridge, and his wife Kate's official three-day visit. (AP Photo/Wong Maye-E, Pool)

Britain's Prince William and his wife Kate, the Duke and the Duchess of Cambridge pay their respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Prince William and his wife Kate, the Duke and the Duchess of Cambridge pay their respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Prince William and his wife Kate, the Duke and the Duchess of Cambridge pay their respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Prince William, right, and his wife Kate, the Duke and the Duchess of Cambridge pay their respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, watch a performance by children from Rainbow Centre, a school for disabled children, in Singapore Wednesday, Sept. 12, 2012. (AP Photo/Stephen Morrison, Pool)

Kate, the Duchess of Cambridge visits the Kranji Commonwealth War Memorial in Singapore on Thursday, Sept. 13, 2012. Prince William says he wants to have two children with his wife, Kate. The British royal has spoken often in the past about wanting to start a family but had not given specific numbers. (AP Photo/Nicolas Asfouri, Pool)

Britain's Prince William and his wife Kate, the Duke and the Duchess of Cambridge, pay their respect to the war dead of both World War I and World War II at the Kranji Commonwealth War Memorial in Singapore Thursday, Sept. 13, 2012. (AP Photo/Wong Maye-E)

Britain's Prince William and his wife Kate, the Duke and the Duchess of Cambridge, pay their respect to the war dead of both World War I and World War II at the Kranji Commonwealth War Memorial in Singapore Thursday, Sept. 13, 2012. (AP Photo/Wong Maye-E)

Britain's Prince William and his wife Kate, the Duke and the Duchess of Cambridge, pay their respect to the war dead of both World War I and World War II at the Kranji Commonwealth War Memorial in Singapore Thursday, Sept. 13, 2012. (AP Photo/Wong Maye-E)

Britain's Prince William, right, and his wife Kate, center, the Duke and the Duchess of Cambridge pay their respects to war dead of both WWI and WWII at the Kranji Commonwealth War Memorial on Thursday Sept. 13, 2012 in Singapore. (AP Photo/Wong Maye-E)

Britain’s Prince William and Kate, the Duke and Duchess of Cambridge, arrive in Kuala Lumpur Internationa Airport in Sepang, Thursday, Sept. 13, 2012. The royal couple is on a three-day official visit to Malaysia. (AP Photo/Samsul Said, Pool)

Kate, Duchess of Cambridge talks with fans who had waited for her and her husband Prince William at Gardens by the Bay during his visit in Singapore Wednesday, Sept. 12, 2012. Britain's Prince William and his wife were greeted by cheering well-wishers as they started an Asia-Pacific tour in Singapore to mark Queen Elizabeth II's 60-year reign. (AP Photo/Edgar Su,Pool)