However, the Ethiopian, when wanting to be baptized, saw some water, probably well water-drinking water, and not flowing water, because of where they were on the road to Gaza was in the desert. Philip still baptized him in that water.
Acts 8:26 Now an angel of the Lord said to Philip, “Go south to the road–the desert road–that goes down from Jerusalem to Gaza.”
Acts 8:36 As they traveled along the road, they came to some water and the eunuch said, “Look, here is water. What can stand in the way of my being baptized?”
As for Catholics and other denominations such as the ones Calvinists belong who do infant baptisms, we know this is not scriptural, since baptism in water is for the remission of sins. One must voluntarily want to be saved, confess, and repent of sins; and babies cannot do that.