When we plead God's covenant with Abraham (Genesis 17) as the Scriptural foundation for baptizing the infants of belivers under the Gospel, we proceed upon these four principles. No credobaptist has ever mounted a case against these four points. .
God's covenant with Abraham is the same in substance as the covenant we are under as believers (Luke 1:54-74; Matthew 21:41,43; Romans 11:16,17; Galatians 3:8, 14, 16; Ephesians 2:13; Hebrews 6:13-18).
In Abraham's covenant, infant were included with their parents and received the sign and seal of the covenant (Genesis 17:9).
The promises to Abraham and his seed descends in substance to believers and their seed (Acts 2:38,39). The covenant sign has been changed in the New Testament to baptism (Colossians 2:11,12).
None of the promises and privileges granted to Abraham and his seed were ever repealed or revoked (Acts 2:38,39).