Probably one of the most used explanations would be, first of all, when they come to an accountable age—when they can understand their need for baptism. Baptism is one of the two ordinances of our church by-laws, the Eucharist being the other. To believe that either is not important would be misrepresenting Scripture.
A child born in a Christian family would or should have training in the knowledge of the Scriptures while growing up. “Train a child in the way he should go, and when he is old he will not turn from it” (Proverbs 22:6). There are times when children want to be baptized for the wrong reasons. For instance, one of their close friends is being baptized. They should be persuaded in their own hearts that they want to be baptized. Scripture clearly tells us of the importance of baptism to those who believe on the Lord Jesus Christ.
Baptism is an outward expression of what is inside an individual. As one acknowledges that they are a sinner and that Jesus Christ died for their sins, baptism is described as an agent to wash away our sins. When they realize this, your children will probably decide for themselves when they should be baptized. You don’t want to force them or just do it to please you. This is one of the most important decisions in their journey to Christ. So let it be a joyful time in their life. In the book of Acts, chapter two and verses 38-39, Peter told the multitudes to be baptized and that it was for them and their children.
Pastor Jake Stirnemann