I have done two at a time and didn't find it made that much difference since the baby is the novelty for the other kids when first starting and things like circletime go by the wayside in favour of playing with the baby and more freeplay while I get a routine worked out. If anything the babies bond with each other and don't feel so bad about being in a play yard together.

Also Aug will be a time of vacations for your daycare too so you might luck out and be down in numbers.

As the same time if you have a family that wants June and things are still iffy with the one you have now what about taking the family for June and just telling the current family that you have decided to terminate as of the end of June regardless of how much progress she is making as in she had her chance to turn it around. Again one of those this just about business and what is good for you and your program.