I have one long term PT child but normally I stick to FT.

When I did allow PT it was for 2 of my places. Parent did contract for fixed day and no ability to swap. I never allowed PT client to have more benefit than FT client. If and only if, I had capacity for different day and parent needed switch, then they pay for that extra day.

I no longer allow parent drop part time in mat leave. Doing that mean loss of income for me. I cannot find temp client for days mat leave family not using and then kick out new client when mat leave end. That not fair. Here, if Mom pregnant and using full time place for current child, they either honour the ft place they contracted for, or leave and hope for two spaces when they need them. But I not taking loss of income for full year just to have child return to their contracted space since I not able promise space for babe anyway. It easier to fill FT place than PT days so I would prefer they just leave.