your son seems to be sufferring from heart failure
with severe systolic( pumping) dysfunction..
As you are saying that this has been diagnosed only 1 month before, cause of failure is important to tell about prognosis and treatmant modalities.
usual pump failure cases are treated with diuretics( lasix, aldactone), digoxin, B blocker, ace inhibitor
In certain cases CRT is useful, and if all modality are failed final treatment is heart transplant.
In some cases like viral myocarditis
this failure is reversible also
therefore you consult a cardiologist
and he will explain you according the cause.