You look more like a Tad than a Chad

The other day a random question popped into my mind about twins and names. I know that parents (mom's especially) are usually really good about knowing which twin is which. But the question I have is when the babies are first born, how do they decide which twin gets which of the two names they've picked out (assuming they have names picked out). I mean, essentially, they look the same. Maybe one's a little bigger, but not by much. Is there a special bond between mothers and children that lets them know which one gets to be Tanner and which will be Taylor? which will be Danny and which will be Manny? which one will be Mike and which one will be Ike? which will be Jin and which will be Tonik?