As with bottles, your baby may prefer a certain nipple type. (webmd.com)
What finally worked for me was starting by giving her a bottle of body temp breast milk... we used a breast - similar nipple type (breastflow or adiri) and let her eat for maybe 5 minutes... so she wasn't too hungry... then I would gently replace the bottle with me... (worked with an amazing lactation constultant who helped with this)... I would then pump after the feeding to make sure I could keep up production and repeat every two hours or so. (babycenter.com)