Sonya,
You've asked the billion dollar question...all companies want their bottles to be the best.  Every baby has a unique suck, and every mother a unique flow, so bottle simply can't be best for every baby.  (though companies claim otherwise)

Mouth placement is important...does baby accept the nipple and rest the lips on a portion of the base, mouth opened widely, or does baby suck on the nipple tip like a straw?  If baby keeps his mouth in a closed position, mom needs to try a different shape.   After mouth placement comes flow and pacing.  A baby will be unable to pace on a bottle that flows too fast, so if the flow seems off, mom needs to try a different brand.  Brands also vary by country, as well as what is available locally vs. online.  

Amy Peterson
co author Balancing Breast and Bottle: Reaching Your Breastfeeding Goals
http://www.breastandbottlefeeding.com/Webinars.php

  

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