‘There are numerous Bible verses, in plain, literal language, that affirm the innocency of infants (…). Consider the following:
(1) Scripture plainly teaches that sin is not inherited. “The son shall not bear the iniquity of the father” (Ezekiel 18:20); every person is responsible for his own conduct (Romans 14:12).
(2) Human sinfulness commences in that period of one’s life that is characterized as youth (Genesis 8:21; Jeremiah 3:25).
(3) A child must reach a certain level of maturity before he is able to choose between evil and good (Isaiah 7:15, 16).
(4) The qualities of little children are set forth as models for those who would aspire to enter the kingdom (Matthew 18:3; 19:14) and for those already in the church (1 Corinthians 14:20). Surely the Lord was not suggesting that we emulate little, totally corrupt sinners!
(5) The human spirit is not inherited from one’s parents; rather, it is given by God (Ecclesiastes 12:7; Hebrews 12:9). Hence, at birth it must be as pure as the source from whence it comes.’
Source: Wayne Jackson, “Original Sin and A Misapplied Passage” (Christiancourier)