I'm not an expert on breastfed babies, although I play one on TV.
It seems to me the paleo/PB diet is the best suited for a healthful outcome for your kids, mainly due to increased amount of omega-3 vs. omega-6 fats.
I always recommend taking plenty of fish oil to women who are pregnant and/or breast feeding. Your kid's brains will thank you later.
I haven't answered your questions really, maybe someone else can get closer for you. Congrats on being a smart mom!!