There are benefits to mothers too - also from www.kellymom.com
Extended nursing delays the return of fertility in some women by suppressing ovulation.
Breastfeeding reduces the risk of breast cancer
Studies have found a significant inverse association between duration of lactation and breast cancer risk
Breastfeeding reduces the risk of ovarian cancer
Breastfeeding reduces the risk of uterine cancer
Breastfeeding reduces the risk of endometrial cancer
Breastfeeding protects against osteoporosis.
During lactation a mother may experience decreases of bone mineral. A nursing mom's bone mineral density may be reduced in the whole body by 1 to 2 percent while she is still nursing. This is gained back, and bone mineral density may actually increase, when the baby is weaned from the breast. This is not dependent on additional calcium supplementation in the mother's diet.
Breastfeeding reduces the risk of rheumatoid arthritis.
Breastfeeding has been shown to decrease insulin requirements in diabetic women
Breastfeeding moms tend to lose weight easier