@Hollyharndale776
No they haven't, but they may have changed gender.
Hollyharndale776 :
boys can have periods too ... they may have changed gender.
[Of course this may be the extravagent and hyperbolic satire everyone would have taken it for when I were young. If so, chapeau , Hollyharndale776: you caught me, hook line and sinker. But if not and it feels very strange even to admit this as a possibility if not, Hollyharndale776 , well ...]
I tried to make sense of this the best way I could. The only possible way of doing so comes if we take the sense of 'gender' (originally from US psychology and sociology) as follows: 'The state of being male or female as expressed by social or cultural distinctions and differences, rather than biological ones' (see OED 'gender' (3)(b))
OK, so these children may have changed gender. That is, in this uniquely possible sense, they may have changed their state of being male or female as expressed by social or cultural distinctions and differences rather than biological ones, so that having originally been in the state of being female, as expressed by biological distinctions and differences as well as by social or cultural distinctions and differences, they now, although still in the state of being female as expressed by biological distinctions and differences, are in the state of being male as expressed by social or cultural distinctions and differences.
So are they boys, these children who 'may have changed gender'?
No.
-- They remain girls because they remain in the state of being female as expressed by biological distinctions and differences.
You are wrong, Hollyharndale776, even under the most charitable interpretation possible of what you claim. -- Wrong.
Boys cannot have periods.
[Of course this is no more than something of a jeu d'esprit -- I am killing time isolated with Covid and do not feel up to doing anything too demanding. Whatsnewpussyhat has a much better response: Don't be ridiculous.
This gender shite is too ridiculous for words, really; we could laugh at it if it did not have the awful consequences it does for some of our children. I really wish they would piss off with their arrant nonsense, Hollyharndale776 and their ilk.]