Lot of books, Faith.
We are, after all, "the people of the Book." Or should I say "the people of the Books." Lots of 'em. Whole libraries of 'em.
One about concepts of marriage and soulmates that also covers breastfeeding? That is a stretch. Will have to think about that. Though you could find a particular magazine called "Natural Jewish Parenting" that might cover it. It's published by an AP homeschooling Jewish (Chabadnik) mama and it's kind of like a "Mothering" magazine from a Torah perspective.
It might cover what you're asking about.
There's a website, too, but it's not up&running at the moment ...