I think it’s not good at all 
After we are born people start to see us and think about us as a boy or a girl even if they don’t know whether we have a vulva or a penis. This is when being a boy or a girl is called our gender.
Ok, so gender is stereotypes. Fine so far.
Your gender is what you decide. You might be a boy or a girl, or maybe you don’t like to decide that.
So gender is stereotypes, but I get to decide what my gender is, presumably based on these stereotypes? Ok.
Of course...girls and boys...can do [and feel and be] all these things if they choose.
So gender is stereotypes, but stereotypes are rubbish because boys and girls can do/be/feel however they want.
So how do I know if I’m a boy or girl, if being a boy is both based in stereotypes, but those stereotypes have also just been rubbished?
When a baby is born parents are told what sex their baby is. A doctor looks at the baby’s body and decides - if the baby has a vulva, they say the baby is a female/girl baby or if the baby has a penis and testicles, they say it is a male/boy baby.
This is great but no more is said about this. So when I’m deciding whether I’m a boy or a girl, where does this come in?
When people grow up, sometimes they decide to change their gender so that they are happier with who they are, this is called being transgender.
This sounds nice and harmless, if gender just means stereotypes and how others see you. But we all know being a transgender child inevitably involves medical intervention. How does this square with the above definitions of gender and being transgender?