Women who have had no children or who had their first child after age 30 have a slightly higher breast cancer risk. Having many pregnancies and becoming pregnant at a young age reduce breast cancer risk. Pregnancy reduces a woman's total number of lifetime menstrual cycles, which may be the reason for this effect.
Breastfeeding
Some studies suggest that breastfeeding may slightly lower breast cancer risk, especially if it is continued for 1½ to 2 years. But this has been a difficult area to study, especially in countries such as the United States, where breastfeeding for this long is uncommon. One explanation for this possible effect may be that breastfeeding reduces a woman's total number of lifetime menstrual cycles (similar to starting menstrual periods at a later age or going through early menopause).
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So its probably correct to say that for a given woman who gets pregnant, aborting her pregnancy and choosing to delay child bearing and breast feeding statistically does raise her risk of breast cancer slightly. But this a more due to the effect of her total lifetime menstrual cycles than the act of aborting the pregnancy.
Again its a case of shouting down the science when its politically incorrect to state the truth.
