Barb Berges wants to obtain copies of video showing differences between
sucking on bottle or breast.  The videos I am aware of are not commercially
sold, but were made as part of research into the mechanics of suck.  Ardren
and Kemp made one back in the 50s and there have been several since (one is
ref. in a 1992 JHL article by Jane Morton) and of course the  imaging  work
of Wilber Smith, et al stands out (see AJDC 1988 Vol 142:7678.)

Infants are capable of creating both positive and negative pressure during
sucking.  Bottle feeding depends more on creation of negative pressure, and
bfg more relies on the creation of positive pressure.  Its the diff between
sucking a straw and stripping a teat with ones hands.  Normal infants can
perform both activities.  Abnormal infants (ie:  weak, premature,
anatomically challenged, ill, etc)  may find the exertions of creating
positive pressure temporarily beyond them.  They are likely to find the less
strenuous effort of using negtive pressure to milk a quickly flowing bottle
preferable to trying to press milk out of a teat.  Again, this is not
"confusion" it is impairment.  Generally such issues are temporary, and with
skill, baby can be fed however, and maintained or transitioned back to
breast  SO LONG AS MILK SUPPLY HAS BEEN PROTECTED.


Barbara Wilson-Clay, BSEd, IBCLC
Austin Lactation Associates, Austin, Texas
http://www.jump.net/~bwc/lactnews.html