A new study from Brazil shows that breastfeeding makes babies smarter, raising IQ by an average of four points, which translates as longer in education and better careers.

Sounds reasonable, right? Everyone has heard that breast is best, and it’s good for the baby’s brain. It’s logical that breastfeeding translates into more education and better careers.

So why has the internet gone mad? Why are the newspapers full of people screaming, “I was bottle-fed and I’m fine”?

The format of the study was good, following 7000 babies from birth to age 30. They examined how the babies were fed, and how long breastfeeding was continued for. They confounded for social-economic status, mother’s education and as many other factors as possible, and examined the children’s IQ and level of education at various stages. By the end of the study, 68% of the original babies were still party of it.

The results…