I think SMA Wysoy is just a brand of soya milk. Can I ask how old the child is that's having it? because my daughter had it for a while before she was 6 months old and was then taken off it because it isn't nutritionally complete, so shouldn't be given to a baby who isn't eating some solids (hope that makes sense!)- that advice came from a peadiatrician and a dietician, but some GP's/HV's (mine included) don't seem to know!