Why do Catholics baptize infants?

My step father is a very active member of the Catholic Church. I have asked him this question, since I am not a catholic, why do Catholics baptize infants? Within the first month or two they are baptized really fast. Why is that?

The following links should assist you in better understanding the Catholic Church’s teaching on baptizing infants. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
Recommended Reading:

[LIST]
*]Infant Baptism
*]Early Teachings on Infant Baptism
*]If a baby dies before it’s born what happens?
]Baptismal Grace (Fathers)
]Born Again in Baptism (Fathers)
[/LIST]

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