I'm interested in this topic too. I'm due in May, and we will be moving to Long Island in September, so I'm thinking ahead and trying to have an idea of a pediatrician or homeopathic pediatrician already lined up before we make the move.
We use Dr. David Rosenberg in Cedarhurst VIPediatrics. I wouldn't call him "holistic" per se but he has not given me a hard time in delaying vaccines. I've never been able to find a homeopathic pediatrician here. Good luck to you.