I know every time the breastfeeding statistics are released, they always show that there are huge differences in the number of white moms who are breastfeeding and African-American moms who are breastfeeding. This comment from abstract for this study states it well, "Previous research has documented startling racial and socioeconomic disparities in infant feeding practices." It makes sense that racial and socioeconomic reasons could be behind the benefits of breastfeeding seeing as how the highest number of breastfed infants belong to white mothers in higher socioeconomic groups which tend to have better access to information, nutrition, health care, better schools, safer neighborhoods, and many other things that can have an impact on the areas typically measured by these studies.
The areas that this study looked at included BMI/obesity, asthma, hyperactivity, attachment, academic achievement and others. Originally, the information seems to show that children who were breastfed did better than those who were formula fed. Then they compared only the siblings within the same family, one breastfed, the other bottle-fed as this would control for racial, social and economic factors. What they found is that there was no statistical difference in 10 out of 11 areas they measured. This is very thought provoking information indeed.
I am still a huge supporter of breastfeeding for moms and babies, but there are some cases where it just can't/won't/doesn't happen. It is reassuring for those moms who feel the guilt of "Breast is Best" and cannot give the "Best" to their baby to know that they may not be robbing them of a higher IQ/lower BMI if they have to formula-feed.
With that said, if you are breastfeeding and having troubles be sure to find help! You can contact La Leche League, WIC office Peer Counselors, and IBCLCs to help. As long as moms are happy and healthy breastfeeding, they should keep on breastfeeding.