Children naturally question who they are--it's part of child development. Read the Absorbent Mind and Citizen of the World by Dr. Maria Montessori. Gender used to mean a pronoun. Sex is biology and not assigned at birth--either you are female (XX chromosomes) or male (XY chromosomes). The problem in today's society is that many people seem to be confused about what it means to be a woman or a man. Just because a boy is more sensitive, doesn't mean he is in the wrong body. Conversely, just because a girl is athletic and strong, doesn't mean she should "transition" to a boy. All children should be treated with respect and dignity and realize they are unique and unrepeatable and have unique gifts to help our humanity, not hinder by this distraction.
Let parents form children, not the school system.