The USA has ratified only 5 of 18 UN Human Rights Treaties

They are:

• The International Convention on the Elimination of All Forms of Racial Discrimination
• The International Convention on Civil and Political Rights
• The Convention Against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment
• The Optional Protocol to the Convention on the Rights of the Child on the Involvement of Children in Armed Conflict
• The Optional Protocol to the Convention on the Rights of the Child on the Sale of Children, Child Prostitution and Child Pornography.

The United States is a signatory to four other treaties, Including the Convention on the Rights of the Child, which it has not ratified.

Check out the UN Office of the High Commission on Human Rights website with a great interactive graphic on these treaties and their ratification.