[crazy1van]

Its very difficult to control for all factors when comparing breast-fed to bottle-fed babies. In 2014, a study [0] was published at Ohio State that compared babies over a long period. When looking at only sibling-pairs (babies in the same family where one was breastfed and one was bottle-fed), the differences in outcome disappeared.

Quote from the link:

"As expected, the analyses of the samples of adults and their children across families suggested that breast-feeding resulted in better outcomes than bottle-feeding in a number of measures: BMI, hyperactivity, math skills, reading recognition, vocabulary word identification, digit recollection, scholastic competence and obesity.

When the sample was restricted to siblings who were differently fed within the same families, however, scores reflecting breast-feeding’s positive effects on 10 of the 11 indicators of child health and well-being were closer to zero and not statistically significant – meaning any differences could have occurred by chance alone.

The outlying outcome in this study was asthma; in all samples, children who were breast-fed were at higher risk for asthma, which could relate to data generated by self-reports instead of actual diagnoses."

[0]: https://news.osu.edu/breast-feeding-benefits-appear-to-be-ov...