Hi Kathy. I just Google searched "Flower Fifth Avenue Hospital in 1957" and found this, among more info.
"The Center's tradition of providing compassionate medical treatment began in 1890 with its predecessor institution, Flower Free Surgical Hospital, then associated with New York Medical College. In 1938, Flower Hospital and New York Medical College merged with Fifth Avenue Hospital at the Center's present site on Fifth Avenue and 106th Street."
From: ArchCare dot org
I was born in 1956 in Misericordia Hospital when it was on E 86th near York ave.
My family lives in Queens, but that was my Mom's Doc's "home hospital" at the time.
I'd like to join Sal with a hearty welcome to this message board, and please keep your memories flowing!