Kate Middleton, Prince William Baby Girl Rumors

Kate's slip of the tongue could hint at gender of royal couple's unborn child.
3:00 | 03/06/13

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Transcript for Kate Middleton, Prince William Baby Girl Rumors
Over to london for the latest on kate middleton. Just about every move she makes makes headlines but nothing like the over-the-top reaction to the half sentence she let out on a royal visit to england. Lama hasan is covering all the commotion. Reporter: It may have been small slip of the tongue, but, boy, is it making huge headlines this morning. It's a girl screams os one, has kate given the game away says another. Could they be having a baby girl? What else could "d" stand for? Never before has the sex of a royal baby been revealed until it was born. It's royal tradition not to do so. But at a walk-about in gripsby yesterday the duchess may have dropped her guard a little. The cat is out of the bag. It's a girl. It's a girl. Well, it's the biggest hint we've had yet that it's a girl. Reporter: The glowing royal mama is usually discreet and good about keeping mum when it comes to secrets and her privacy. Ording to one woman when she was given a teddy bea she said thank you I'll give that my "d" and then she stopped herself. Reporter: She quickly realized her mistake. You are going to say daughter, weren't you said the well wisher? Kate insisted, no, we don't know and then said we're not telling. The duchess also revealed other royal baby secrets. She's craving cupcakes and, oh, yes, the baby is kicking. And with a july due date the baby could be a diana birthday baby. The book of favorite names are elizabeth, no surprise there, william's grandmother, queen elizabeth iii would have a lovely ring and diana as well. Reporter: Even kate's famous mother-in-law never thought there would be a queen diana. Maybe now there will be. The palace commenting on whether the royal couple is expecting a boy or girl but my friend at the palace said they're dealing with this by confirming, quote, it's a baby. But either way, boy or girl, this baby will be the next king or queen, george and amy. Let me get that down. It's a baby. Okay, that's good to know. The thing about this is that somebody -- a real person heard the whole thing. Reporter: Exactly. Kate was overheard saying it, saying the "d" word. If you think about it what else could "d" stand for apart from daughter? Everyone here is buzzing about this, that she could have revealed it. George and amy. Okay, lama, thanks. Amy made a good point, it could have stood for my darling boy. Yeah, it could have.

This transcript has been automatically generated and may not be 100% accurate.

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