September 12, 2015 09:45 AM

Eric and Jessie James Decker are only a week into their new life as the parents of two kids, and the family dynamic is “great already,” he told PEOPLE.

Well, mostly.

“I guess, with two kids who aren’t sleeping through the night makes it a little more hard — but other than that the dynamic is great already,” Decker, 28, said at Cantor Fitzgerald Charity Day in New York City Friday, where he was supporting the EJD Foundation.

“Obviously [newborn son Eric Thomas Decker ll is] only a week old but [17-month-old daughter] Vivianne, our oldest, is just very nurturing and very sweet with her brother.”

Courtesy Jessie James Decker

With two kids at home, the New York Jets wide receiver said things are coming into focus for him and his recording star wife, 27.

“We had this conversation yesterday: It’s like, all right, it’s real, like we’re parents now,” Decker said. “Not just one kid — it’s like children.”

Decker said his wife has “obviously taken the brunt of the no sleep, but she’s doing great.”

“She’s just a natural mother, and it’s just fun to see her in this realm,” he said. “She’s such a good artist and business woman but to see her as a mother, especially breastfeeding, it’s real cool.”

Vivianne, he said, is like a sponge: “She knows what she’s saying, she’s trying to copy what you’re doing.” Decker can’t wait for his son to get there, too.

Noam Galai/Getty

“Just that stage when he gets there, having fun, rolling around, wrestling, kicking some footballs around,” Decker said. “Take him out fishing. Take him down to the beach, just the fun things I enjoyed and just enjoyed growing up, just to kind of get him in that environment and see him smile and have fun.”

After all, that’s what parenthood is all about, he said.

“It’s such a crazy feeling,” he said. “Seeing your kids smile and be happy and having a good time is so rewarding.”

GALLERY: All the Places Jessie James Decker Has Taken Her Growing Baby Bump

— Adam Carlson with reporting by Alexandra Hurtado

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