Don't get me wrong, I'm certainly open to the argument that land use policies are a problem. And I am no fan of minimum parking rules. At the same time, I also know that parking doesn't cease to be a problem just because you don't want to build it. I've had the joy of going to a doctor's office where I couldn't figure out where to park within a 5 block radius of it. What was a convenient doctor when I lived within that 5 block radius turned into a miserable experience when I moved a bit further away. Same experience when dropping the kids off for a birthday party in some denser part of town. (At least there I can gripe to the kids saying they need to bike the 10 miles next time. Isn't that far, all told. :D)
Back to the question, labor strikes me as a thing that would be rather expensive for child care. Specifically, child care that isn't staffed by teenagers and has adequate staffing for the number of kids being cared for.