Originally Posted by incogneato
So which came first the chicken or the egg?
Are kids who are higher iq disproportionately receiving breast milk?
Or are more high iq moms choosing to breastfeed?

We'd have to see the data. Changes at the margin can skew results!

First set 1,2,3,4,5,6,7,8,9
Second set: 2,2,3,4,5,6,7,8,9

The only difference is the 1 became a 2.