Let the Little Children Come Unto Me

“She was baptized, with her household” (Acts 16:15). The Philippian jailer whom Paul and Silas had converted to the faith was baptized that night along with his household. We are told that “the same hour of the night . . . he was baptized, with all his family” (Acts 16:33). And in his greetings to the Corinthians, Paul recalled that, “I did baptize also the household of Stephanas” (1 Cor. 1:16).

http://www.catholic.com/tracts/infant-baptism