Kate Middleton Steps Out One Day After Giving Birth (PHOTOS)

07/23/2013 06:20 pm ET | Updated Jul 25, 2013

It's hard enough stepping out weeks after giving birth, but one day? Now that's something.

Due to royal tradition, Kate Middleton debuted her newborn son -- and post-baby body -- today (July 23), just one day after welcoming her first child with Prince William. The Duchess of Cambridge looked flawless in a polka-dotted dress by British designer Jenny Packham. The brand-new mom was all smiles as she and Wills introduced the Prince of Cambridge to the world, gushing that they "couldn't be happier."

"He's got a good pair of lungs on him, that's for sure. He's a big boy –- he's quite heavy," Prince William told reporters of his 8-pound-6-ounce baby boy while exiting St. Mary's hospital this evening in London. "He has got her [Kate's] looks, thankfully."

As for Middleton, the 31-year-old said this experience has been "very emotional," continuing, "It's a moment that any parent having just given birth will know what this feeling feels like."

See photos below:

kate middleton post baby body

kate middleton

kate middleton

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