I found your coment , you were right only 10 is still questionable but I think it's slow developed cockorel.. I could post pictures of GIRILs they are now 10 weeks old I think :)
I just take more pictures of 10 you say you want see tail.. it's maybe roster but every other cockorel have red Comb and develop wattles maybe this is slow one.. all in all we will see, I will update not because of gender more to show their development.
Just short update I will update in few days all , they are now 5/6 week old .. this is nbr.10 that's why I think its a girl.
Just hysop shared my opinion this is female, hope we were right 🤗