I don't know of any specific guideline, but the data points were crafted to give additional credit when provider/patient communication was hampered such that docs had to sort through additional external information to draw their conclusions. For example, when an elderly spouse contradicts the history such that two scenarios have to be sorted out, or if a patient needs an interpreter who repeats information in another language, without the provider really knowing if the translation is valid. In the case of obtaining information from parents/guardians of infants, well, that's the standard method for obtaining history, so information is being received in the normal way. One would hope that the information that mom is giving is complete and correct, but that's the only way the provider's going to get that information. Think about it. In the real world, the infant wouldn't ever step up and announce 'wait!!....my mother's confused!!....I had two bowel movements yesterday!' You get my point. The parent is always going to be the primary method of communication regarding infants, so getting two additional points for that is inappropriate.