I have a short list of stuff that I encourage them to look into because they will have to decide shortly after birth:
kangaroo care (for premies)
whooping cough vaccine (I send them to CBC)
I think vaccines are out of SOP. We don't get any training in it as a doula.
Most (all?) of my clients take a CBE class, so I get to go over stuff that isn't usually covered like:
How to be empowered in a hospital
what I can do to help and when
Engaging dad in what works for him
The only thing that I cover with all my clients that is not really doula related is:
What dad does better than mom (cause the boobs don't get in the way).
parenting: I tell clients that they can question everything. There is a lot of room for learning. And not to take anyone's advice (even mine) unilaterally. They will figure out what works best for them. And there is time for everything and to trust their intuition.
I do offer info at the PP on: EC, basic sign instruction, some sleep hints, and pumping help---not as a doula (what does a birth doula know about sign language?) but as a thoughtful mom whose brain they get to pick. These are things that have worked for me, and if they want to know about them, I am happy to share.