Why moms of 3 are so stressed—but moms of 4+ are so chill

A survey by TODAY found moms of four or more kids report lower stress levels than moms of fewer kids, but why?
I have one child. Just one, single child, yet it often takes me a solid hour to get out of the house. When I’ve finally shut the door behind us, I wonder how people with a bunch of kids do it. Then again, sometimes I’ll see a very chill parent getting off the bus while baby-wearing, pushing a stroller and simultaneously directing a small gaggle of school-age kids and think, She looks way less stressed than I feel. According to a survey of more than 7,000 mothers, she probably is.