Only hours after welcoming a son into the world, Prince William and Kate Middleton released a statement Tuesday thanking everyone at St. Mary’s Hospital in London for their hard work and patience.

“We would like to thank the staff at the Lindo Wing and the whole hospital for the tremendous care the three of us have received,” the couple said. “We know it has been a very busy period for the hospital and we would like to thank everyone – staff, patients and visitors – for their understanding during this time.

William and Kate, both 31, welcomed a son Monday afternoon at 14:24 GBT, weighing 8 lbs. 6 oz.

“We could not be happier,” William said in a statement Monday.