They are always small and a little chubby with short hair
Yes! Very frequently. I see them not being ‘girlie’, then being further pushed into the ‘not properly girlie’ box by their female peers who are interested in fashion and make up. They don’t or can’t take part in ‘girlie’ discussions, so they feel less and less like a girl. They look in the mirror and compare themselves with ‘real’ girls at school or the celebs like the Kardashians with their hourglass figures, pouts, eyebrows and glamour.
They then declare themselves NB and feel that has reduced the pressure to be ‘girlie’, and also elevated them in the social order a bit because they’re now ‘trans’. They get treated with more care and interest by their teachers. They now have some cachet.
IMO, what’s needed is a huge focus on what I thought we’d dealt with in the 70s and 80s - namely that there’s no one way to be a girl. You can look how you want, wear what you want, have short hair or long or anything in between. You can like pink, you can like blue. You can like babies and cooking, hate babies and cooking, be neutral about babies and cooking. You can like Maths, sport, weightlifting, rugby or whatever sport you enjoy.
I would also specifically refer to stereotypes and why they might exist, and who they might favour. I would show the life of women through the decades, including the huge move forward - and then the current move backwards. That should start in primary school and be massively reinforced. Boys should, of course, have something similar.
I can’t believe how we’re at this point in 2022.