Yes, it is very common for newborns to use nursing or a pacifier to soothe themselves, even when they are not hungry. It is easy to mistake these non-hunger cues for starvation, which can sometimes lead to overfeeding. If your baby is consistently sucking for comfort, try using a pacifier or offering gentle physical comfort such as patting or skin-to-skin contact, and be mindful of their intake to avoid overfeeding, which can cause them to throw up.