In "Parks and Recreation," Leslie Knope and Ben Wyatt have triplets at one birth. Their three children are born during the time jump between the sixth and seventh seasons, after the couple learns that Leslie is pregnant with three babies.
The pregnancy is revealed after Leslie and Ben are already married and established as a political and professional partnership. In the episode “One in 8,000,” a doctor tells them they are expecting triplets. The news is both joyful and overwhelming, especially because Leslie is balancing public service, career opportunities, and her famously intense work ethic.
The children are named Stephen, Sonia, and Westley Knope-Wyatt. Their names continue the show's habit of mixing Leslie's enthusiasm for history and public figures with personal family references. The triplets are later shown as toddlers and older children in flash-forward scenes.
This question can be confused with other pregnancies in the series. Ann Perkins and Chris Traeger have one son, Oliver, while Diane and Ron Swanson have a son named John. Leslie and Ben's defining family milestone is different: they become parents to three children simultaneously, not twins or a single child.