> As I understand it: While handedness is not "expressed" until after the
>   toddler years, handedness is actually
>   neurologically determined much earlier, by genetics and, depending on
>   certain factors, also by the prenatal
>   environment. It is in utero that the brain is most rapidly developing, and
>   it is also in utero that twins have a prenatal
>   environment different from a singleton's. . . .
>
>   (If indeed that kind of movement is the environmental variable that the
>   neurobiologists are talking about-- I just don't
>   know the literature well enough to say)
>

I think this is very interesting and very relevant. There seems to be a
correlation between some
assymetry problems and problems with suckling in the literature on
multiples' development in utero.
I'd better dig out those references... I've discussed it, some, in the
archives.
Jo-Anne Elder-Gomes, IBCLC


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