question about dr Browns bottles

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hi everyone. we r using Dr Brown s bottles for my 2 month baby. I switched from preemie nipple to size 1 coz feedings took for us about 45 min. but with this nipple baby getting so fussy between feedings and I have to burp him many times. do u think I need to switch back to preemie nipple? when u switched from preemie nipple to size 1?