Interestingly, the couple had announced the pregnancy just 10 days before the Scottish referendum in September last year.
Prince William, 32, and his wife Kate, 33, had so far not confirmed any date for the birth of their second child except to confirm that he or she is due in April.
But during a visit to Brookhill Children's Centre in Woolwich, east London, yesterday a volunteer asked the Duchess of Cambridge when her baby would be born.
It has led to speculation across the British media that if 18-month-old Prince George's brother or sister is even a few days' late, it could be born on or around the day of the poll on May 7.
More From This Section
According to 'The Telegraph', that could be good news for the Conservative party, as "anything that gives the country a feel-good boost so close to polling day is usually regarded as a plus for whoever is in power".
The royal baby could also be born on great grandmother Queen Elizabeth II's birthday on April 21 or even on William and Kate's fourth wedding anniversary on April 29.