Prince William and Duchess Kate Middleton welcomed their third child, a baby boy, on Monday morning. Hours later, in keeping with tradition, they debuted the newborn outside the Lindo Wing at St. Mary鈥檚 Hospital.

Stepping out in a vibrant red dress, Duchess Kate cradled her son in a white knit blanket and matching hat. His tiny hands could be seen peeking out from the swaddle, as his mother reached for and stroked his fingers, trying to tuck them back into the blanket.

Prince William and Duchess Kate then left St. Mary鈥檚 Hospital for Kensington Palace in a black car, with William driving and Middleton sitting in the back with the baby in his carseat.

Earlier in the day, the newborn鈥檚 older brother, Prince George, 4, and sister, Princess Charlotte, 2, accompanied their father to the Lindo Wing to meet their new sibling. Charlotte happily waved to the crowd, while George smiled and kept his gaze down as he was helped up the stairs into the hospital. They returned home to Kensington Palace shortly after, ahead of their parents and new baby brother.

Kensington Palace is expected to announce the newborn鈥檚 name in the next couple of days, as was the case with both Prince George and Princess Charlotte, whose names were shared two days after their respective births.

The public debut is a tradition for the royal family. Prince George made his debut one day after his July 22, 2013, birth, and Princess Charlotte, like her new baby brother, first appeared in public just a few hours after her arrival on May 2, 2015.

What do you think of the royal baby鈥檚 debut? Let us know @BritandCo!

(photos via Jack Taylor/Getty Images + Samir Hussein/WireImage + Ben Stansall/AFP/Getty Images)