Your baby has developed a sleep association whereby he's using your boobs as props to help him sleep. It's not because he's hungry but rather he is so used to being nursed to sleep. Even if you use pacifier you are also actually introducing another sleep prop because he would need you to put it back for him when he loses the pacifier. The best thing is for you to teach him the art of self settling so that he doesn't wake up in between his sleep cycles.
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