They’ve just become an aunt and uncle to Prince Harry and Meghan Markle’s first child and celebrated the birthdays of their two youngest kids—and some royal fans are hoping baby fever will still hit Kate Middleton and Prince William hard enough for them to try having a fourth child together.

According to Express UK, betting odds are currently at 7/2 that the Duke and Duchess of Cambridge would add to their family in the future by having a fourth child.

“A year on from the birth of Kate and William’s third child Louis, Harry and Meghan’s firstborn is the biggest story in the world right now,” Betfair spokeswoman Katie Baylis told the publication. “The Duke and Duchess of Cambridge have warmly welcomed the new arrival and now there is speculation that the little royal may have got the couple feeling broody again.”

“We make it 7/2 that Kate and William will have a fourth bab6y which would excite royal fans who can’t get enough of royal babies,” she added.

The new odds come after reports that despite suffering from hyperemesis gravidarum during all three of her pregnancies with Prince George, Princess Charlotte and Prince Louis, Middleton is okay with the possibility that she’d have to endure the extreme form of morning sickness again because she does want to have a fourth child, just like Queen Elizabeth.

“Catherine would like another baby,” a source said. “She loves children and is prepared to put herself through another pregnancy even though they have been complicated by severe morning sickness in the past.”

There has been a frenzy over whether Middleton would have a fourth child for months, though recently, the couple has also seen themselves as the focus of reports of marital strife, following allegations Prince William cheated on his wife with Rose Hanbury while she was pregnant with Prince Louis. Those allegations have since been believed to be unfounded.