February 20, 2015 06:30 PM

Eugene Gologursky/WireImage

With all his expertise in interior design, you’d think Nate Berkus would be itching to decorate his baby-on-the-way’s sleep space — and you’d be wrong!

“I’m Jewish, so we don’t decorate the nursery before the baby’s born,” Berkus, 43, told PEOPLE Thursday at the Unstopables home fragrance scent decor collection launch in New York City.

“It’s a superstition; it’s a cultural thing,” Berkus explains. “I think it means you’re tempting fate, so I’m not tempting anything: healthy baby, gorgeous nursery on the way. Knock on wood!”

In September, Berkus announced on Facebook that he and husband Jeremiah Brent were expecting their first child via surrogate this spring.

This isn’t the first time the designer-turned-TV personality incorporated his heritage into a major life moment: When he and Brent, 30, tied the knot in May, they included the ceremonial glass breaking into their service. And by the sounds of it, the dads-to-be are still in the honeymoon phase.

“The truth is that I’m happier now than I’ve ever been,” says Berkus.

“I really think that if you divide life into buckets like relationship, career, health, those are the main three universally for everyone … Something about being married means that that bucket has been decided,” he explains.

“We are together, we work through everything we need to work through, we figure out ways to add to each other’s happiness, and because of that, we can focus on our relationship and making it better and making it work for both of us, but it allows for us to shift our focus to other things as well. It’s a very peaceful place to be.”

— Jeff Nelson

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