The argument from silence is powerful. The Jews were use to a salvation for them and their family. When they crossed over the line to Christianity one would expect to see a great argument somewhere in Scripture that their children were no longer in the covenant, if they were under the credo view. Since, no argument exists in Scripture the argument from silence states that the children must still be in the covenant and thus a paedo view existed in their day. There is thus a continuity in the covenant.

Reformed and Always Reforming,