His May 6th arrival was celebrated across the globe - but his dad's comments have many thinking he was actually born two weeks prior.
Harry, 34, and Meghan, 37, spoke from Windsor Castle on Wednesday with their newborn.
The new dad told the press, "Everyone says that babies change so much over two weeks."
"We're basically monitoring how the changing process happens over this next month really. But his looks are changing every single day, so who knows."
His comment had some thinking he meant his child was already two weeks old.
One fan asked: "Everyone says the baby has changed so much over two weeks .. wasn’t it born Monday? Omg the panic in their faces lmao he SLIPPED UP!"
"Did Harry just say: The baby has changed in the last two weeks?"
"Prince Harry said Baby Sussex had changed so much in two weeks. Wasn’t he born like yesterday?"
We're betting the slip was more of a case of baby brain!