<child-comp [addItem]="addItem" [isApproved]="isApproved"> </child-comp>

export class Child{
    Input () addItem: boolean;
    Input () isApproved: boolean;
    MyList=[];

    PushNewItemToMyList(){ /*code relevant to adding a new list item*/ }

    ngOnChanges(){
       if (this.addItem){
         this.PushNewItemToMyList();
         this.addItem=!this.addItem; /* Negation line #1 */
        }


      if (this.isApproved){
          this.MyList[i].icon='new.png';
          this.isApproved=!this.isApproved; /* Negation line #2 */
       }
    }
}