Abstract: Breastfeeding has long been touted as improving immunity and having other benefits. However, this study demonstrates that the opposite is true, and that breastfeeding results in increased infections and delayed development.
Introduction: Many studies have shown benefits of breastfeeding, but there are limitations to all these studies since the breastfeeding and non-breastfeeding groups are different. This study looks at babies of the same sex from the same parents, so obviously they're exactly the same.
Methods: Two babies, both girls, from the same parents were studied, examining the number of infections, rate of growth, and developmental milestones. Subject #1 received breastmilk for only six months and got formula supplementation during that time. After six months, Subject #1 received only formula. Subject #2 received only breastmilk for the first six months, then very minimal formula supplementation for the rest of the first year.
Results: At the end of the first year, Subject #1 was at the 99th percentile for both height and weight. She had zero ear infections and zero infections requiring antibiotics. At the end of the first year, Subject #2 was at the 5th percentile for weight and 50th percentile for height. She had been treated for two cases of conjunctivitis and three ear infections. She also threw up a bunch of times. Subject #1 crawled and pulled up two months earlier than subject #2. Subject #1 walked at 10 months of age (data on Subject #2 still pending).
Discussion: Subject #1 showed significantly decreased infection rate compared with Subject #2, in addition to improved growth and reaching milestones. Since Subject #2 received more breastmilk than Subject #1, this likely accounted for the differences.
Conclusion: Breastmilk, once thought to be so great, is actually a source of infection and developmental delay. Who would have thought it?