I waited 1-2 weeks before making any food changes for new babies. In the meantime, you could break up some of the current TOTW kibble you have and add a bit to the puppy's kibble until it's time to change, that wouldn't really hurt much if you just add a bit.
I don't know about the size of the puppy TOTW.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |