You have three sources on his profile. In order:
1. His baptism on July 20, 1839, born the night before of the legitimate marriage of Michel Hill and his wife Mary "Orooke". Godfather was John Ryan and the godmother was Elizabeth Whiteford.
2. Marriage record for Michael Hill and Mary O'Rourke.
3. Burial record for William, interred in the parish cemetery on February 20, 1840 at the age of seven months.