You're a mother with a young child, who always wants to come with you everywhere, including to the bathroom. Every month you have the stress of making the child wait outside, confused and upset, while you--now also upset and stressed out--deal with sanitary products and all the rest.
If only you had a child-friendly book to explain all this to your little one, so that they didn't feel abandoned, scared, or confused, and you could have some privacy
Why Does Mummy's Tummy Hurt? explains periods in a warm, child-centred and age-appropriate way, to help mums in exactly this situation.