Marguerite Felsenfeld and Steven Rotstein of Stamford announce the birth of their son, BENJAMIN NOAH ROTSTEIN, on April 18.  He joins big sisters Risa and Miranda.  Benjamin’s grandparents are Dr. Herbert Felsenfeld of West Hartford and the late Rita Ackerman Felsenfeld, and Betty Rotstein of New York, N.Y. and the late Natan Rotstein.