Prince George and Princess Charlotte’s new sibling—who’s now fifth in line for the throne—was born this morning at 11am UK time. According to the Kensington Palace official Twitter account, the royal baby weighs 8lb 7oz, and Prince William was present for the birth, of course.
Now that we know it’s a boy, the next topic of discussion is: what will his name be? According to the BBC, “Arthur, Albert and Philip [are] among the current bookies’ favourites for a boy.” There’s good reason for these speculations: Arthur is shared as a middle name by both Prince William and Prince Charles; Albert was the real name of Queen Elizabeth II’s father (though he assumed the name George after taking the throne); and Philip is, of course, Prince William’s grandfather.
Until we get the official announcement, we’ll just refer to the baby as “His Royal Highness Prince of Cambridge,” which Good Housekeeping says is an automatic title accorded to Prince Williams’ children due to a special decree issued by Queen Elizabeth in 2012. Crowds are already forming outside the Lindo Wing of St Mary’s Hospital, on the steps of which the Duke and Duchess of Cambridge debuted newborns George and Charlotte. If you want to catch the first glimpse of Royal Baby #3 live, head to TIME’s live stream from the hospital entrance.