I would say it is more of a cultural stigma. In this country, anyway, if a child (or adult) takes their own life it isn’t as widely publicized as it would if they died of cancer, car accident etc.
We read in the paper about all the details of a car accident, if the person had been drinking, where they were coming from, what they wanted to be when they grow up, photographs of them from the year book etc. But if a child takes their own life very little is said typically. Very few families feel comfortable talking about it openly. Details are rarely in the paper discussing the childs struggles or events leading up to the suicide. This type of death is treated differently in this country.