County claims for aid to needy children placed in foster care, as defined by the rules and regulations of the department, shall be filed separately and distinct from other claims and shall be filed for aid furnished by the county at times and in the manner prescribed by the department. Payments for such children may be made subsequent to the furnishing of care and support to needy children in foster care. Payments may be made at the end of each month for the needy children maintained in foster care during the month.