A child was born with a girl-like vulva and was raised as a girl, and when he grew up and became an adult, he found that he was not a woman, and when he went to the hospital to check his chromosomes, he found that he was XY, a pure man, medically known as male pseudohermaphroditism, or perineal hypospadias; a little boy, who looked good, was often given flowery clothes and pigtails to dress up as a girl, and one day after he grew up, he suddenly told his parents that he wanted to be a woman. One day after the boy grew up, he suddenly told his parents that he wanted to be a woman, he was now a woman in a man’s shell, and he was determined to go for a sex change operation, otherwise he could not live. All these are related to the lack of correct identification of gender or non-normative gender upbringing. There are multiple levels of gender, from chromosomal gender to genetic gender, from genital morphology to anatomical gender, to the important social gender. Social gender includes civil gender, dependency gender and self-identified gender. The gender identified after birth and registered with the public security registry is the civil gender; the parental gender is the dependent gender; and the self-identified gender is the self-identified gender from the time of understanding. The civil gender, the adopted gender, and the self-identified gender are usually the same. If parents raise children according to their own preferences, such as raising boys as girls or girls as boys, with hair styles, clothing, and environments that do not correspond to their gender, this long-term misrearing can have a significant impact on self-identified gender. Once the self-identified gender is misidentified, it is very difficult to change and adapt to the life of the other gender. So, at what stage of a child’s life is gender misassignment likely to occur? Let’s start with the development of children’s gender perception. 1.5-2 year olds can distinguish whether the other is male or female, and by age 3 is the basic gender identity period, when children can identify themselves as boys or girls, but cannot yet understand that gender cannot be changed; 3-6 years old is the gender stability period, when children know they will still maintain the same gender when they grow up, and begin to look for messages related to gender differences and try to behave in a way that conforms to their gender The age of 6-7 is the period of gender constancy, when the concept of gender is fully developed and the child understands that gender does not change based on appearance or situation. If parents or relatives do not encourage their children to engage in activities that correspond to their own gender before the child’s gender-constant period of 6 years old, but encourage activities according to the opposite gender, it may lead to gender misalignment that is difficult to reverse, thus causing gender dysphoria. Therefore, it is important for young parents to pay attention to the early education of children’s gender orientation, otherwise it leaves endless consequences.