Barrientos' mother signed the parental consent form so her daughter could enlist.

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The DOH passed a regulation in September requiring all those who perform the ritual to get parental consent on a form stating that the procedure can lead to health risks.

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Pitofsky said the simplest way to obtain parental approval would be to print out a consent form posted on a Web site and mail it back.

CNN: Senate weighs online privacy rules for tots

The new guidelines clarify that written parental consent is not needed for each activity and encourage schools to use a new one-off consent form signed once when a child starts at a school.

BBC: School trip red tape 'to be cut' by Michael Gove