I'm not certain what you are looking at below. Was this a listing of baptisms, a family on one page or what?Since I see several for a single year, I suspect they are unrelated Fontaine.I believe the "110" is a page reference for the original church record. I found Cleophas/Cliphas on page 42 of the 1862 St-David church records. He was the son of Jean-Baptiste Fontaine and Marie Gaulin, a different family.
St-David is a town, not a district.The family has connections to Yamaska, so I checked records for St-Michel church there, but also did not find anything.Other towns that would be easy to reach is St-Francois-du-Lac and St-Guillaume d'Upton.I picked these towns because they had established churches in that time period. Other towns nearby did not have a church yet.I didn't finish St-Francois-du-Lac. I haven't started looking at St-Guillaume d'Upton yet.
Of course, there is a possibility he was baptised well outside of the area, perhaps in New Hampshire. Railroads were in operation around 1850.
Wish I could get a copy of the 1861 census page. Maybe I should invest in an Ancestry.ca membership. Transcription often suffers. It is better to view the original page.
In the 1861 census, a Marguerite b.1851 is also part of the family we are researching. This may be a missing child that died young. I don't know yet.