This free collection of 711,220 tramscript records, new to MyHeritage, contains PEI birth and baptism records of individuals born from the year 1702. Records typically include the name of the child, date and place of birth, date and place of baptism, the name of the church, the names of the parents, including mother’s maiden name, and the name of the clergy who performed the baptism. 

You might also want to check the Ancestry collection Prince Edward Island, Baptism Index, 1788-1943, and the PEI Archives database at https://www.princeedwardisland.ca/en/service/search-public-archives-material-online