Mosaic Down Syndrome? My DD's paediatrician has suggested that this might be what's causing all of her problems, and is referring her to a geneticist. It something like only a percentage of her cells have the trisomy? If this is what she has?? It seems that some of the effects are : congenital heart problems, higher incidence of asd, Hearing difficulties, repeated ear infections, only one crease line in the hand? (I didn't think it was weird that DD only had one and I had 2...), MLD especially with mathematics, gross and fine motor problems, and respiritory problems, And NOT always having downs features?? Now most of these (except the respiritory problems) DD has...It is really weird to think that there might be an answer out there for this, I just wondered if anyone else had heard of it? I've tried phoning the down syndrome association but I keep getting 'service unavailable'.