I wish you well in your search and hope that you have been able to contact St. Vincent's. I was adopted from St. Vincent's in 1953. It was known as St. Vincent's Hospital and Childrens Asylum. St. Vincent's was also referred to as a Hospital for Unwed Mothers. A woman could go to St. Vincent's and register to give her baby up for adoption some would reside in house and work at the Orphanage and Hospital, others would be placed in homes during their nine months and act as nannies and housekeepers. They would receive medical care each month and when they went into labor would deliver the baby at St. Vincent's., where it was immediately taken to the nursery and placed for adoption. The were unable to hold or see the baby but were allowed to give the baby a name which was usually changed by the adopting family.
I was lucky because my adopting family had the paperwork from my adoption and my mothers name was in the papers. I had contacted Catholic Charities and was told to send them my information and upon receiving my info. and request they would send me a form to fill out. I was told that there was very little information in the files from that time and that if they did find them the names of my parents would be blacked out. I never followed through because the form I received wanted to know about my adopting family and why they adopted me. Nothing to do with my request. Because of the paperwork my parents had was able to search for my mother a few years ago and now have another family to love. Good Luck with you search.