It's a survey, not a scientific article.
It mixes up exclusively BF babies with mixed fed babies which is a nonsense.
Claire-Buy-My-Book is involved which says it all, really.
Or turn it around and say, "FF babies communicate less and get fatter" and see what the uproar would be (as this is just as valid an interpretation of the so-called "data").
Dull, dull, dull and yet another example of the media coming out with crap for the sake of it.