Here's an article that sounds similar to the one Kathy Dettwyler is
referring to. The bit that lumps breastfeeding in with bottle or sippy cup
is below:

http://chicagotribune.com/business/chi-020212sippy.story?coll=chi-business-h
ed

> Some speech pathologists worry about overindulgence. When children drink from
> a bottle or breast, they perform something speech therapists refer to as a
> suckle-swallow. The tongue lays flat and moves mostly in a back-and-forth
> pattern.
> 
> Drinking from a regular cup, however, requires a more complicated swallow. The
> cheeks and lips suck the liquid onto the tongue, then the tongue squeezes,
> lifts and propels the water down the throat. That action helps build the
> muscles required for proper speech ‹ at least according to one school of
> experts.

If that link breaks, try this one:

http://makeashorterlink.com/?W2A314F6

Jodine Chase

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