I'm interested to know what a "waning policy" is? I don't have one!
I say to new parents - Go with your gut instinct, ask yourself, can I see my child in this setting, do I think she wold be happy here, visualise her on the floor playing, pop her on the floor and look around her, does it feel right.
How does the childminder react or speak to her, some will approach straightaway, some bide their time until the child has been there a little while, judging when to pick up your little one.
Most childminders are very experienced at settling i new babies, I look at those in my setting and take into account who already have and their developmental stage, is it right for them too, to have a new baby at that time.
The dynamics make a huge difference to the setting, I have turned people down as I did not think that they or maybe their child was right for me and my setting, after all I have a duty of care to those children too.
For me, it's about getting the balance right, not just taking on a child because I have a vacancy, I wait for the right family and as some of those families have been with me for over 7, 9 and 11 years, the least has been 2.6 years.