Don't want to be over capacity however don't want to get screwed either

[mickyc]

I disagree. IMO the commitments you made with the original families and that particular child come first. If you can accommodate baby No. 2 then so be it, if not then no. I would never change a families schedule to accommodate something better that has come along.

My advice would be to ask the mom on mat leave if it would work for her to go down to Friday's only. If not I would say you don't have room for baby no. 2 then.