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Women should know the truth. They can take it; they are adults, not children. If a mother opts for formula rather than breastfeeding, there is good evidence that her baby will score lower on IQ tests and will have a higher risk of many illnesses including some cancers, diabetes, respiratory illnesses, diarrhea and ear infections. She should know that her own risk of breast, ovarian and uterine cancer will be higher, as well as her daughter’s risk of breast cancer. The mother increases her own risk of diabetes, high cholesterol, high blood pressure and becoming overweight by “choosing” formula feeding. There is accumulating evidence that the risk of mental illness (alcoholism, ADHD, schizophrenia) is increased by not breastfeeding. A recent study suggested that even behaviour problems in adolescents are more likely if the child was formula fed. The longer the child is breastfed, the lower the risk both for the child and the mother.
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Jack Newman (Dr. Jack Newman's Guide to Breastfeeding: updated edition)