There is a real possibility that William and Kate's baby could be born on July 1, 2013, the date William's mother, Princess Diana, would have been 52. July 1 is also important to Wills and Kate as it was on that date in 2007, after the Diana Memorial Concert, that they were seen back together after their brief split. So Baby Cambridge would make it three reasons to celebrate July 1.
With the baby (babies?) due in early July—we can work that out from the fact that Kate is less than 12 weeks pregnant and wanted to announce it at Christmas—the baby should be born in early July, although many do not arrive on the due date. Princess Diana put it around that William was due on her birthday, but that could have been to put the press off scent. He was born June 21, 1982 and was apparently full term. Her first pregnancy was announced on November 5, 1981, which seems to have been inside the 12 weeks that people usually wait to announce a pregnancy — but Diana was more impulsive than Kate.