question and suggestion please

Dapat ko na bang palitan ang feeding bottle especially nipple? Avent natural nabili kong feeding bottle, pero nstart ko ng ibreast feed for the 1st week baby girl ko, now mix na... umiiyak sya especially pag patulog a or antok kapag avent natural gamit kong feeding bottle pero pag precious moments na hindi naman kami nag aaway... nalalakihan kaya sya dun sa teats? is it nipple confusion?