If you don't mind me asking - why so long? Our pediatrician recommended my wife breastfeed our son a year. Beyond that, he said, there are no benefits.
Nursing is not a "benefit," it is normal. Forced weaning causes harm (for both mother and child). Not just strictly nutritionally, nursing is very much about physical contact and social relationships too. There's plenty of info if you type a couple words into google. A half century of formula advertising has created a lot of ignorance as fewer people have experience with nursing.
