The loosening, for some people, of rigid role definitions for men and women has shown that dads can be great at calming babiesif they take the time and make the effort to learn how. It's that time and effort that not only teaches the dad how to calm the babies, but also turns him into a parent, just as the time and effort the mother puts into the babies turns her into a parent.
To worry about spoiling an infant by comforting him when he cries is needless.... If you put the baby down and the baby cries, pick him up. His crying isn't a habit you should try to break. Your baby can't be taught not to cry.