That's what bothers me the most. I thought about mentioning it in the OP. What happens when a baptized 8 year old gets molested? Now you have an arshole adult brother in the back room denying the charge and accusing the baptized child of slander.
Not only that, but the baptized child will be considered a 'penitent' and could be bound by the same rules of confidentiality as the 'clergy'. In some states, the penitent is not compelled to reveal what is said in a 'priest-penitent' communication.
http://en.wikipedia.org/wiki/Priest%E2%80%93penitent_privilege
The statutes vary from state to state, however,...
In twenty-five states, the clergyman-communicant statutory privilege does not clearly indicate who holds the privilege. In seventeen states, the penitent's right to hold the privilege is clearly stated. In only six states, both a penitent and a member of the clergy are expressly allowed by the statute to hold the privilege.
The baptizing of children is going to muddy the waters in child abuse cases when it comes to the revealing of 'confidential' information'.