I think it's kind of normal to feel a special affinity for one over another. It may be because she seems tinier and more vulnerable...like she needs you more. I am one of those people who are often drawn to the 'underdog' or the weak or sick ones...even the funnier-looking ones sometimes. Who knows? Somehow we bond with one more. I feel guilty sometimes too...but then I pay attention how I feel for the other one or ones, and they are also very special in their own ways
