Does anyone know how to convince a mother of letting her child use a high absorbency tampon since the child's blood flow is very heavy?

Answer 1

A child shouldn't use tampons - tampons aren't recommended to pre-teens or teens, it's recommended that younger women use menstrual cups which are safer than tampons so pose no risks such as TSS or dioxin exposure. As cups are safer there are fewer precautions for a child to have to remember.

Menstrual cups are a better option for heavy flow anyway because they hold a lot more thna tampons (tampons hold 18ml max, cups up to 42ml max), they don't increase bleeding as tampons can, they create light suction to prevent leaking, also unlike tampons cups can be worn overnight and no need to alternate with pads so a lot more convenient with heavier flow.