I'm happy to see this conversation come up here. I feel I am in two different movements at times, the natural/instinctive parenting one, and the permaculture one. Why shouldn't they be the same world? So this is great.?
Some really great resources have been mentioned in this thread.
I want to mention that Sally Fallon's book about babies has been criticized by many in the natural parenting community for its bias. I was in the WAPF camp for a while, but I became outraged at Sally Fallon's anti-breastfeeding position. She denies being anti-breastfeeding but her overall position clearly has the impact of being so. Fallon is a dairy farmer and heavily promotes a homemade formula using raw cow milk and raw cow liver for babies which La Leche League points out is highly problematic. In contrast, the ancestral way of handling a situation where a mother is having trouble breastfeeding was other mothers in the community would breastfeed the baby (modern application of this is through peer-to-peer milksharing networks like HM4HB on Facebook.)
Fallon puts forth in her book and elsewhere that any mother who does not eat a ridiculously impossible "nutrient rich" diet (which includes way more food than anyone I know would eat in a day and most of it not readily available) has substandard breastmilk and then a baby would be better off with her cow milk formula. Her book just her view on baby raising and has no basis in the science of attachment or biological evolution/ anthropology or anything other than her own opinion. To be fair, I believe that her own opinion is perfectly fine for her own choices but not fine to put in a book and press onto other people.
For prenatal diet and preparation, I recommend instead Chris Kresser's program The Healthy Baby Code, which is based on an ancestral (paleo) diet. I find the paleo diet more in line with polyculture by the way.