I don't think this doctor understands what re-birthing is.  Does he say not to give the baby a bath until the immunizations are through?  BTW, I have seen a seven week old take to the experience successfully.  

I have noticed, even without the bath component, many babies, when lying belly-to-belly nuzzle their way towards the breast of the person holding them.
Even when we are all clothed.  A few babies I have seen do this were exclusively bottle fed, and not responding from habit, but from nature.

Sincerely, Chanita