Consider in March/April letting the parent know that you will not be taking school age children come the end of June so that she has time to book them into summer camps or consider her alternatives. Then advertise for replacement children for the end of June. That way you get one year olds that will be 15 months plus come September and ready to join in the daycare programming as compared to waiting and getting one year olds for Sept. Over time the parents you have may start maternity leaves and that is where school age can fit in since the mom can bring the child at 9 and pick up right after nap before the school age returns.