Prevent Cruel Handling of Information Leading to Deportation Harm Act of 2018 or the Prevent CHILD Harm Act of 2018 This bill amends the William Wilberforce Trafficking Victims Protection Reauthorization Act of 2008 to prevent the Department of Health and Human Services (HHS) from considering the immigration status of a proposed custodian when determining whether to place an unaccompanied alien child with such person. The Department of Homeland Security may not use information provided by an unaccompanied alien child or information initially obtained by HHS to make a suitability, home study, or secure facility determination in order to apprehend or remove from the United States: the unaccompanied alien child, the proposed or current custodian, a resident of the home in which the proposed or current custodian resides, the proposed or current sponsor, or a resident of the home in which the proposed or current sponsor resides.