In Hebrews 5:12, the author first introduces the milk vs solid food metaphor, rebuking readers for needing elementary teaching, which verse 13 expands on.

In Isaiah 28:9, the question 'whom will he teach?' refers to those weaned from milk — the exact image of spiritual infancy used here.

In Romans 2:20, Paul uses the same infant metaphor for those needing elementary instruction — parallel to the milk-fed immature here.

In Ephesians 4:14, believers are urged to no longer be children tossed by doctrine — directly parallel to the infant immaturity here.

In 1 Peter 2:2, newborn infants crave milk for growth — contrasting with the negative milk metaphor for immaturity here.

In Matthew 11:25, Jesus praises infants as recipients of revelation — opposite of the negative infant metaphor here.

In Mark 10:15, receiving the kingdom like a child is commended — contrasting with the negative infant metaphor here.

In 1 Corinthians 13:11, Paul contrasts childish thinking with maturity — similar to the infant vs. adult metaphor here.

In 1 Corinthians 14:20, Paul warns against being children in thinking — echoing the same call to maturity here.

In 2 Timothy 3:16, Scripture is for instruction in righteousness — the same 'word of righteousness' that babes have not mastered.