I have no idea what priests or nuns would do. I doubt anyone would do what you suggest these days.
Baptism doesn’t equal salvation in babies or adults.
Nearly 800 babies found in a septic tank in Ireland.
Do you know where this septic tank was located?
Why no burial on sacred ground?
Sorry, but I believe you are wrong. Here is a quote from Jesus. Do you believe it?
“Unless you are born of water and the spirit, you shall not enter the kingdom of heaven.” John 3:5
http://biblehub.com/john/3-5.htm