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If you're breastfeeding, it's important to know how long to nurse your child so as to get the optimal health benefit for your baby. Most current research on the health benefits of breastfeeding centers on the first six months to a year of life. After this point, the medical data on extended breastfeeding--breastfeeding beyond a year old--tapers off, and the decision to breastfeed becomes a personal one. A 2008 Australian study conducted at the University of Western Sydney on long-term breastfeeding found that mothers who ended up breastfeeding longer than two years hadn't planned to do so, but over time and with peer support they changed their minds.