I don't get that. Why is the assumption that a crying baby should be taken to Economy? If the parents paid for first class seats and the baby crys, it should stay in first. If the parents paid for economy class seats and the child crys they should stay in Economy. Unless you are advocating that if the child in economy cries it should be taken to first (i.e. that whenever a child cries, a change in class should be the normal reaction.)