Ok, thanks. Yes she did exist. I found her as Mary Baker in some records and Polly Baker in others. I was concerned that Polly Baker was a sister second wife to my ancestor. However...subsequent children were born to Mary Baker. This stuff is tough! I am going to assume that Polly is a nickname. It is of course possible that a woman named Polly stepped into the marriage midway had a baby but Mary just stayed in the marriage.Safest bet seems to me that if Mary never left the marriage then all the children were hers.