Primary school children will be given lessons to help them prepare for a member of staff becoming a woman.
Chris Kean, 38, will start living as a woman by next summer.
He works as a canteen worker at Over Primary School, in Cambridgeshire, where a headteacher has called on parents to be supportive.
But not everyone is in favour, with plans to teach children as young as four about transgender issues branded ‘disgusting’.
In a letter sent out to parents, headteacher Mike Fish wrote: ‘All staff in school have been aware of this for some time and we have begun to prepare children in a very general sense by taking opportunities in class and assemblies to talk about equality, diversity and different life-choices.’
And it continued: ‘I sincerely hope that as a school community we can show our support towards Chris and his family during what will be a challenging time.
‘I also hope that we can take this as an opportunity to help prepare and educate children to live in our diverse British society and to develop values such as individual liberty, mutual respect and tolerance.’
Parent Mike Smith, 47, told The Mail: ‘What we object to is our little one – who can’t even spell left and right yet – hasn’t been taught anything about sex education, but we have been told they are going to be teaching about transgender issues.
‘Talking to a child of that age, without asking our opinion first, is absolutely disgusting.
‘I don’t have a problem with him doing this, but I would like to have been told before my children were told.’
And his wife Jennifer, 42, said: ‘I was angry about it, and I think a lot of people are.
‘It is confusing enough in life for children as it is, and I just don’t understand how a four-year-old is going to understand that.’