Pigeon's  masterpiece of engineering:  
http://www.malaya.com.ph/oct24/liv3.html
 
"The nipple also has fine bumps or texturing at its outside edge to keep 
the  baby’s lips from sticking to the surface and while its tip is designed to 
fit  the sucking fossa, or the small indent in baby’s mouth. It also comes 
in two  kinds of holes to adjust flow according to a baby’s stage of 
development or  age." 
~~~ Wow, my babies were really missing out - MY nipples had no fine bumps 
by  their lips to keep them from sticking, or different sized nipple pores 
for when  they got bigger. Thanks for sharing this though, Nikki. Always good 
to be  prepared for questions... 
Peace,
Judy 
Judy LeVan  Fram, PT, IBCLC, LLLL
Brooklyn, NY,  USA
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