“The baby was born weighing 4 pounds and 5 ounces.”

“Their Majesties The King and Queen, along with other members of the royal family, have all been informed and are overjoyed with the news.”

Although the exact number of weeks Beatrice was pregnant when she gave birth hasn’t been disclosed, an earlier statement from the palace in October confirmed she was due in “early spring.”

Meanwhile, Athena’s birth weight suggests she arrived a bit early, as she weighed about the same as two and a half bags of sugar.

According to NHS guidelines, a full-term baby at 37 weeks typically weighs between three and four kilograms (up to 8.8 pounds).

Beatrice first shared the news of her pregnancy in October.

At the time, the royal family marked the announcement with new photos. One showed little Sienna walking hand-in-hand with her father and big brother, Wolfie, along a scenic country path. Another image captured a beaming Beatrice as she posed for the camera while her husband embraced her.

In an official statement, Buckingham Palace shared: “Her Royal Highness Princess Beatrice and Mr. Edoardo Mapelli Mozzi are very pleased to announce that they are expecting their second child together in early spring; a sibling for Wolfie, aged eight, and Sienna, aged three.

“His Majesty The King has been informed and both families are delighted with the news.”