MATLAB: Is this giving me two outputs instead of one and how to fix it

Question

 if BirthM == 1
          if BirthD == 1
          fprintf (fileID,'\n you are %d years %d month and %d day old', BirthY,BirthM,BirthD);
          else
          fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
          end
    fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
    end
    if BirthM ~= 1
         if BirthD == 1
         fprintf (fileID,'\n you are %d years %d months and %d day old', BirthY,BirthM,BirthD);
         else
         fprintf (fileID,'\n you are %d years %d months and %d days old', BirthY,BirthM,BirthD);
         end
    fprintf (fileID,'\n you are %d years %d months and %d days old', BirthY,BirthM,BirthD);
    end

I want this to only give me one message thats says depending on the month (You are something years, something months and something days old depending on whether or not the days or month equal one or not so I can change the message.

Every time I run this, it outputs the same message twice. Why?

Answer 1

 if BirthM == 1
          if BirthD == 1
          fprintf (fileID,'\n you are %d years %d month and %d day old', BirthY,BirthM,BirthD);
          else
          fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
          end
    fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
    end

Look at the code again, formatted:

     if BirthM == 1
         if BirthD == 1
             fprintf (fileID,'\n you are %d years %d month and %d day old', BirthY,BirthM,BirthD);
         else
             fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
         end
         fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
    end

and it becomes more obvious that you do the two first fprintf() depending on BirthD, and that after having done that, then either way you proceed to do another fprintf()

You do not want that last fprintf() that is done unconditionally.