Yes, children below the ages of 6 must be accompanies by a parent or a nanny/trusted guardian who can assist them in their bathroom needs. Kindly note the classroom guidelines to be followed by nanny/guardians here.
Children above the ages of 6 who can independently use the washroom, and can be picked up and dropped off safely without assistance are allowed to come without a nanny.
Please note that timely pick up of independent remains the responsibility of the parent, and must be done promptly to avoid discomfort for the child.