That person is my main candidate. He is the only Charles Simard I can find that doesn't show up married in later census information. I have also found that Ides Bouchard (the mother) died in the town that my Charles Seymour was living in. Her death was the same year that he donated land for the local church cemetery.
I don't know if all that info proves that the 15 day old Simard is the person I am looking for, but I think he's the right one.