So could royal twins be really on the way? Bookies seem to think so, and this time, science is on their side. More and more people are now under the impression that Meghan Markle has better chances of having twins than Kate Middleton as far as first pregnancies go.

According to Healthline, pregnant women over 35 have higher chances of having multiple births. This is because older women produce more follicle-stimulating hormone (FSH), which is responsible for preparing the egg for ovulation every month. Its enhanced presence also means that women have greater chances of releasing more than one egg during ovulation. Since Meghan is having her first pregnancy at age 37 while Kate was only 30 when she got pregnant with her first child, Prince George, the former is at an advantage.

Data also support the possibility of Meghan having twins for her first go. Statistics per Baby Centre show that there is one twin pregnancy in every five pregnancies in women between the age 35 and 40.

Thanks to these scientific facts, speculations that Meghan and Harry will be parents to royal twins are stronger than ever. The rumors have been around practically since they announced the pregnancy, although most of the talks then were just from people who were stunned by how big the mom-to-be's belly has grown during the early months of the pregnancy.

The rumors intensified after Irish betting company Paddy Power received overwhelmingly high bets predicting the twin pregnancy. The organization had to stop taking bets altogether and posited that there has to be insider knowledge floating around for bettors to have such confidence.

If Meghan were to give birth to twins, they will be the first ones of royal blood in six centuries. The last twins to be born into the royal family are that of James I of Scotland and Queen Joan Beaufort. They had twin boys named James and Alexander in 1430. But the latter died shortly after he was born, while his brother eventually became king.

It is to be noted that since Kate has given birth before, her chances of having twins this time around has also increased. However, it is unknown at the moment if she and Prince William intend to have another royal baby. There are worries that the Duchess of Cambridge may have a hard time. After all, single pregnancies can be a very intense sickness for her already, so it might become more unmanageable if she carried twins.

Meanwhile, Meghan and Harry's bundle of joy will be out in the world this spring. When it comes to baby names, Diana, the name of Harry's late mother and the former Princess of Wales, is a favorite among bookies. Some believe Arthur and Alice will be good names for the royal baby (or babies) too.

Prince Harry and Meghan Markle Meghan, Duchess of Sussex, and Prince Harry, Duke of Sussex, attend a reception to mark the fiftieth anniversary of the investiture of the Prince of Wales at Buckingham Palace. Will the royal couple have twins? Dominic Lipinski - WPA Pool/Getty Images