Been there done that, not looking forward to the heifers we have calving-here's hoping for some brains in the bunch. I'd have that cow up to the barn, into a head catch if you have one or a chute, and get that baby up to her and some warm milk into it asap. In place of a head catch, we've roped the head, tied it off and then put a loop on a back leg and pulled it back and brought the calf up to it and got it to suck.
If its not up by now it is pushing the bounds of saving it, I'd go ahead and tube the little thing and get its guts working and warmed up.
I'm calf watching tonight myself, but luckily its a 5 yr.old cow so she's done this before. Hope she holds off till tomorrow so I can move her into the barn. We also need to get the bull into his pasture tomorrow, don't need to meet him at night anymore, and sure don't want the cows re-bred till early June.
Good luck with the calf, sure hope he makes it. My bathtube has saved several of the little cuties with this nasty MN springs.