I have some part time children too. Boy comes Monday only and another comes other 4 days, one of my other spaces I have a child that uses 2 days and another family that uses 3 days. The difference here is that they are all paying for the days they use. Because the family only needs 3 days of care I am free to find another child that needs the other two days. If the family that booked three days needs more for that week I have to say sorry I can't help you because they didn't reserve them. If you want all five days available to you whether you use them regularly or just occassionally you need to book and pay for all the spaces every week.