(1) The child-to-staff ratio for a day care center is:

(a) 4:1 for children zero months through 23 months;

(b) 8:1 for children two years through three years;

(c) 10:1 for children four years through five years; and

(d) 14:1 for six years and over.

(2) When children of different ages are mixed, the ratio for the youngest child in the group must be maintained.

(3) Only the day care center director, primary caregivers, and aides may be counted as staff when determining the staff ratio.