I can't find that either.
The linked YouTube videos about menstruation are American, from 2018, and religiously avoid sex, using "people with uteruses" etc.
But on the other hand the "KidsHealth" page is clear and sex-based.
One question a girl will have is: When will I get my first period? This usually happens about 2 years after her breasts start to develop. The menstrual (say: MEN-strul) period, or monthly cycle, is when blood is released through the vagina. That may sound alarming, but it's normal and it signals that a girl is growing up and her body is preparing so that she can have a baby someday.
The contrast between the two sets of resources is stark. One is clearly answering questions, the other is trying to avoid answering them.