In a clip on TikTok, Brandi Mills hands her toddler, Laney, the little girl's doll to put to bed. The interaction starts off innocently, with the 19-month-old taking the doll in her hands.

For millions of girls across Africa and Asia today, menstruation means staying home from school. Often, owing to a lack of period products, these girls miss up to a week of class every month.