About a year or so ago my husband, premier scientific literature
searcher, tried to get some info about this perennial question.  he got
nowhere in the scientific studies.  It doesn't seem as if anyone has
looked at it systematicallly in a study or even a published anecdotal or
case note.

Sarah

Sarah Friend Barnett   LLLL, IBCLC
Bronx (New York City), NY  -  [log in to unmask]
" You are not obliged to finish the task,
 neither are you free to neglect it."       R. Tarfon