The Voice coach explained that he and Lambert are just too busy focusing on their careers to even consider starting a family right now.
"We just talked about that earlier this week, and I think we both agree that we're a couple of years away from seriously talking about that," Shelton revealed to Us Magazine. "It's just that there's a lot of this stuff that's happening right now, and it only happens once.
"We want to be able to enjoy this and focus on our careers so when it is time, we'll be ready to sit around and watch that happen."
Shelton went on to joke that Lambert is already using her maternal instincts to care for the couple's pets.
"If she's anything with an actual human being like she is with dogs, the kid's gonna be golden," the 'Honey Bee' singer said.
Shelton recently revealed that the secret to being a good husband is being "a little bit of a pushover".
The Voice airs Mondays at 8/7c on NBC.
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Watch Blake Shelton and Miranda Lambert perform 'Home' below: