You do not say the date of this death certificate but I think you must accept that it would be absolutely impossible for anyone to say exactly what was wrong. Diagnosis was, until comparatively recently, very primitive, simply due to lack of knowledge. Oedema is simply swelling caused by an accumlation of fluid and is a symptom, not a disease. It is one of the symptoms of heart disease (cardiac disease) but a modern diagnosis might be able to narrow down the actual fault more accurately. It is also a symptom in other medical conditions. The glottis is part of the throat and a swelling there could have been a f deformity or symptom of some illness. Heart problems were relatively common and in the past the parents would just be told the child was unlikely to survive childhood - today they would probably be operated on and live normally. Such things were often congenital but not necessarily to do with the mother being ill - and even if it were, the connection was not known. The fact that mothers who contract rubella (German measles) while pregnant can cause really serious problems for the child, while barely affecting the mother, was only discovered comparatively recently (last 50+ years I think) but you also have to take into account that many similar congenital conditions were not caused by the mother suffering from rubella. You will never know for sure - the child was born with some congenital condition from which it died - best just to accept it as written. Hope this helps.