Yes ma when introduced to formulas baby will get nipple confusion and will get adapted to bottle feed as it is easier & baby gets enough milk . Just access dhese two ma.. 1.whether you have enough breastmilk secretions? 1.whether baby is properly positioned during breastfeeding.

Sew for proper signs and attachement of breast feeding.. One video available on youtube from AIIMS ,  see this video there is domonstration of Breastfeeding. Stop Formula feed or give over and above breastfeeding if require. This is my advise.

You need help from a lactation consultant. Until then: 1)hold baby skin to skin a lot(this keeps baby relaxed and interested to feed.also gets your milk volume up) 2)use a breast pump to extract your milk to feed baby.do this on a schedule of atleast 8 times a day.( this way, breast milk volume is maintained and baby gets benefit of your breast milk) 3)if you are using a feeding bottle--stop. Use a pallada or spoon.( sucking from a bottle is very different from sucking at breast, and can confuse baby)

If you are bottle feeding the baby ,give it by katori spoon. Bottle feeding causes babys to refuse Breast feeding.

Stop formula feeding....give exclusive BF.... See for proper latching technique.... You should continue your effort for BF so baby will learn it....keep patience from ur side as it takes few days....