Terms of contracts are changed all the time in business. But what it means is when one party wants to change the terms the other party has the right to walk away from the contract without penaltly. So let all families know in writing that now that you have had a chance to develop your routines and settle into your new career that you are going to allow 5 daycare children to attend your program and as of whatever date will begin advertising to fill the spaces. Then go into how it is legal and the norm. You could also put in something that rather than raise daily fees to cover the loss of income you are going to bring your program up to the provincial standard for numbers and leave it at that.