They call that nipple confusion. Babies who latch on usually don't like the bottle. That happened to my LO. To make the transition easier before I went back to work, we made sure she drank milk from the bottle during the day. I only let her latch on to me "after work".
Others recommend nipples that are similar to latching on like Medela calma because the LO needs to suck before milk comes out, unlike other nipples where the milk freely comes out. Go for softer nipples also like pigeon.
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