I keep having issues with my husband where he cites psychological authorities to argue that it's time for our daughter, 20 months, to wean. Freud would say she needs to move on from her oral fixation to her anal stage or whatever. Klein treats the breast as primary object in object relations psychology, but then the child needs to relate to other objects. Winnicott has his whole thing about transitional objects, the teddy bear or non-mama beloved thing which eases the transition to a world where mama is not always physically present. Our daughter likes teddy bears well enough, but they are no substitute for the real thing; it's a whole other relationship. My husband's claim, or one of them, is that while she's still nursing, our daughter will never get the idea that I still exist even when I'm not there. He equates attached and dependent, more or less. So my question is, do you have thoughts or book recommendations for the compatibility of extended breast feeding with psychological health, and especially, healthy development of object relations? I've read William Sears, but wonder what else has been done in the way of research.