Sex change?
Answers: A "a girl [who] changes to a guy" - more correctly, a transsexual man - commonly stops having period within a few weeks of starting hormone (testosterone) psychoanalysis; most transsexual men will have a hysterectomy formerly having genital reconstructive surgery, so he will patently not have period after that.
A "guy [who] changes to a girl" - more correctly, a transsexual woman - cannot ever hold periods; she is born in need a uterus, or ovaries, and medical science has not but reached the point where on earth transplantation of these organs is viable (and when it does, you can be sure that transsexual women will be placed very firmly at the BACK of the queue).
Transsexual women can't (and for the foreseeable adjectives, won't be able to) carry children; which is a source of great sadness for some of us.
yes
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