Except as set forth at §B of this regulation, the provider shall provide additional personnel for all duties not involving direct supervision of children, such as personnel for food preparation and service, housekeeping, transportation, clerical, and other duties, if necessary to maintain the correct staff/child ratios at all times. Additional staff need not be provided if children are involved in appropriate activities and supervised at all times while necessary duties, such as food preparation, are performed. A child care home that provides a regular service involving the use of specialized health care procedures or equipment shall use as a consultant in providing the service a registered nurse, nurse practitioner, physician's assistant, physician, or other registered or certified service professional as appropriate.