Answer: because of their age
Step-by-step explanation:
The United Nations issued the Declaration of the Rights of the Child in order to remind the world that children had rights as well. It was prudent to do so because children are too young to be able to fight for themselves so adults have to do so for them.
Some of the rights that were recognized were: the right to be fed, the right to be free from exploitation and the right to develop normally amongst others.