I know there are many people who struggle with the doctrine of infant baptism, and there are many others who have a difficult time explaining the Biblical doctrine of baptism to those who hold to "believers' baptism." If you fall into one of these categories, or if you just want to brush up on the Scriptural teaching about baptism, check out the series of lectures on baptism by Norman Shepherd, former professor at Westminster Theological Seminary, on this page:

http://www.trinity-pres.net/audio/norman_shepherd.php

It's the best explanation of covenantal baptism that I've ever heard, and well worth a listen.