Pacifiers will not satisfy a baby’s hunger. Hence, hungry babies won’t take a pacifier. Babies are in an oral stage of development. They often want to suck or feed not only when they're hungry but also when they're tired, in pain, distressed, for comfort or for pleasure. Young babies (under 3 months) have a strong urge to suck.
Many will want to suck at times other than feeding to feel contented. They often want to suck when tired, overstimulated, bored, uncomfortable, when in pain, and for pleasure. So a baby's desire to suck does not prove he is hungry and vice versa.