Sickness policy, bringing/making formula and milk, hours, late pick up, vacations (paid? How much notice?). Cloth diapers if you intend to use them. Maybe ask about cleaning at the house/facility. Changes of clothes for accidents, etc. state certified? Infant CPR training up to date? Ability to dispense medication (our provider cannot give any meds).
Also, if it's a good day care they will answer all these questions automatically. I brought a huge list of questions and only needed clarification on a couple.