Nina, I'm glad you are asking these questions. We DO need to question 
our assumptions and make sure we are not just parroting misinformation.

There are several different kinds of studies comparing bottle feeding to 
breastfeeding. Misuno Katsumi of Japan has done a lot of work comparing 
flow and swallowing characteristics. Ardran and Smith studied breast vs 
bottle with cineradiography, but their latches were atrocious, and their 
frame rate was low to reduce radiation exposure. Other groups have 
looked at electromyography (muscle activation) between feeding methods, 
and found significant differences.

We have been looking at all methods of feeding in our ultrasound study, 
but we don't have sufficient numbers of any one brand of bottle to make 
judgments yet. It can be hard to make comparisons, because we are 
imaging whatever methods of feeding the parents are using - 
breastfeeding, bottles and fingerfeeding so far. Also, our babies are 
tongue-tied, at least for the first ultrasound, so they are NOT sucking 
normally.

It would be an interesting study to gather a bunch of bf babies with no 
feeding issues, whose moms are working and bottle feeding ebm during the 
work day, and image them all on several different bottles.

Catherine Watson Genna, IBCLC  NYC

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