Question:
Why do you baptize babies?

Answer:
Some non-Catholic Christians believe that Baptism is necessary and sets us free from sin. Many others think it is merely a symbol of one’s desire to follow Christ, having no real effect upon the soul. While most Protestants agree that Baptism is a good idea, many do not believe it is really necessary; and many think is unbiblical to baptize babies. Some fundamentalists believe that the only acceptable Baptism is by immersion. 

The Catholic Church teaches that Baptism is both necessary for salvation and regenerative, causing us to be reborn as children of God. Through Baptism we receive the life-giving, sanctifying grace of the Holy Spirit. This grace wipes away Original Sin that stains each soul because of the fallen nature we inherited from Adam and Eve. The Church prescribes Baptism by water in the name of the Father, Son, and Holy Spirit, as the normative gateway to God and his family, the Church. The Church has baptized infants from the earliest times and continues to do so today. The Church also teaches that catechesis must follow Baptism to properly assist the baptized on his Christian journey. Both immersion and sprinkling are acceptable forms of Baptism in the Catholic Church.

Takes away all sin. Now, why delay? Get up and have yourself baptized and your sins washed away, calling upon his name. Acts 22:16

To be administered to children. People were bringing even infants to him ... whoever does not accept the kingdom of God like a child will not enter it. Luke 18:15-17