November 06, 2015 08:15 AM

Jessie James Decker is loving spending time with her “chill” baby boy Eric Thomas II, but with two under 2 now, there also comes a bit of chaos.

“It’s really great, the dynamic between all four of us, having one more addition,” says the singer, 27, whose Christmas EP, “This Christmas,” debuts Dec. 4. “Now that there are two babies in the house, it’s a lot more action!”

That action includes Daddy, New York Jets wide receiver Eric Deckerbonding over football games and making room for “tummy time” with baby Eric, 9 weeks, while mom keeps 19-month-old daughter Vivianne Rose in on the fun — all while functioning on very little sleep.

“Every now and then Vivi may try to get a little bit of attention when I’m breastfeeding him, but other than that. she’s been a really big help,” says James Decker. “She’ll help throw the diapers away or she’ll help bring us a diaper. She’s trying to play that big sister role.”

Dustin Cohen

And with Decker, 28, in football season, family outings include trips to the stadium.

“I love fall and football season. It’s just so much fun, there’s so much excitement,” says James Decker. “Vivi is yelling touchdown and cheering him on. I just love it.”

Dustin Cohen

As for whether she thinks they’ll expand the family anytime soon: “This number feels good,” says the budding fashion designer.

“I’ve been pregnant for two years so I just want to have a break. But ask me in two years and I might be pregnant again. Knowing this one, he just blinks at me and I’m knocked up!”

Dustin Cohen

For more on Eric and Jessie James Decker’s happy family, pick up the latest issue of PEOPLE, on newsstands Friday.

— Ana Calderone

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