I don't think anyone can tell you that anything is "absolutely and completely safe", unfortunately. I know many members here feed Prey Model (raw meaty bones, organ meats, etc) and their babies do well. I feed Pre-Made Raw (Primal) and love it.
As far as age, I'm not really sure when some Prey feeders have introduced it to their pups, but hopefully they'll chime in.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |