Worst Forms of Child Labour Convention 1999, para. 3 (d)
[For the purposes of this Convention, the term the worst forms of child labour comprises:] (d) work which, by its nature or the circumstances in which it is carried out, is likely to harm the health, safety or morals of children.
International Labour Organization
Means of adoption
ILO Convention No. 182, Worst Forms of Child Labour Convention (1999), Article 3 (d).