Before Calvary – minors were never permitted to eat the meat of the Passover lamb. Since then – it is similarly impermissible for minors to eat of the Lord’s Supper which precisely in Christ’s Calvary week replaced that ancient sacrifice.
In Holy Scripture, we are told that – at Calvary – Baptism replaced Circumcision. Romans 4:11-24; Galatians 3:16-29; Colossians 2:11-13. The Lord Himself declares that Circumcision was administered usually in infancy – just eight days after birth. Genesis 17:12f ; 21:4f ; Luke 2:21; Philippians 3:5f.
God’s Word also teaches that the Lord’s Supper replaced sacrificing in general and the Holy Passover in particular. Luke 22:1-20; First Corinthians 5:6f ; Hebrews 10:1f. Yet such sacrificing and the Passover were only for catechized adults. Genesis 18:2,7,12,32f ; Exodus 12:3f,26f,37f,48f ; Numbers 9:2-14; First Chronicles 21:5; and Luke 2:40-47. So too is the Lord’s Supper. First Corinthians 11:27f ; 13:11f ;14:20; 16:13. Thus – Catechism before Communion! Hebrews 5:12-14; 6:1-2; 10:22-23; 13:10-17.