"As a new daycare my policies may not be perfect so as issues arise I will amend and correct my policies and procedures accordingly. I thank you for your understanding and co-operation."

The only part I would change, is the part that sort of "takes away" from you as a provider. Even the best of providers need to change policies and rules once in a while! Just remind them that, from time to time, revisions may be necessary.
Good luck with this!!