With rumors swirling that the Duke and Duchess of Sussex are expecting a baby boy—Meghan Markle is said to have told friends at her recent baby shower that they are having a son—there’s a chance the public might know the sex of Baby Sussex before too long.

But it might not be a case of blue for a boy and pink for a girl according to a source close to the couple. The duchess is understood to have told at least one friend that they want to raise their baby without gender-stereotyping, which means the nursery might not be filled with toy trains and cars if it is a boy. The Sussexes have already planned a gender-neutral nursery and opted for whites and grays over conventional blue and pink color ways, and this seems to be in line with Meghan’s ideas about how to raise children.

“Meghan has been talking to some of her friends about the birth and how she and Harry plan to raise their baby. Her exact word was fluid,” a source told Vanity Fair. “She said they plan to raise their child with a fluid approach to gender and they won’t be imposing any stereotypes.”

Exactly what the duchess might have meant when using the word “fluid” is unclear, and there are multiple possible interpretations. Last month actress Kate Hudson sparked a round of headlines when she said she was raising her daughter “genderless” in an interview with AOL. She later clarified on Instagram that she meant raising her kids “to feel free to be exactly who they want to be,” and that she used the phrase “genderless approach” to refocus “the conversation in a direction that could exist outside of the female stereotype. It just felt a little antiquated to me. Not all girls want to be a princess, some want to be king.”

Harry and Prince William were raised with toy cars, toy guns, and toy soldiers, and Meghan has talked about playing with Barbies as a little girl. But a more progressive approach is increasingly popular in America and is considered very much a millennial parenting tactic. More celebrities, including Angelina Jolie and Paloma Faith, have all discussed raising their children without stereotyped ideas about gender in interviews.

If Harry and Meghan are indeed planning to raise Baby Sussex with more progressive ideas about gender there is plenty of research to back them up. According to a study in the Journal of Experimental Child Psychology, children enrolled in Sweden’s gender-neutral kindergarten system had access to more opportunities, which the researchers predicted would equate to more success as adults.

A Kensington Palace spokesman declined to comment.

EDITOR’S NOTE: After this article was published, some outlets leapt to the conclusion that the Sussexes were planning to raise their child “gender fluid”—a claim Vanity Fair never made. Kensington Palace has raised no objection to Vanity Fair's article, though it has denied the “gender fluid” suggestion elsewhere.

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