Are there one or more play areas? There is one.
Is there one in every terminal, after passport control? Only terminal C has one, and it's between gate C-25 and C-27. Incidentally, the USO is also in this area. The USO is not labeled on any maps; you have to call it from an airport phone to find out how to get there. It's a nice little perk for military families, with some snacks and a movie lounge, as well as a tiny little play space. I'm not complaining about the size-- hey, it's a wonderful resource even without the play space.
Is the play area conveniently located? Not unless you're flying from terminal C.
Is there information about the play areas available online? nope. I couldn't remember the gate numbers, but found some handy info at sleepinginairports.com to jog my memory.
Are maps clearly labeled to make finding the play areas easy? no, I found it difficult to find the info.
Are there one or more nursing areas? not that I saw.