Utility is an economic term for a person's overall well-being and satisfaction. Consumers play a role in the economy by maximizing utility, which means allocating their scarce resources, such as limited time or money, most efficiently. Utility maximization is different for every person.
You can start using it right away but it was suggested to us by our midwives to hold off until 6 weeks as pacifier use can mess with their breastfeeding latch (it's a different kind of sucking).
Until then, your choice is either to get rid of the pacifier altogether, or to let your baby cry it out in the middle of the night, says Janet K. Kennedy, Ph.D., founder of NYC Sleep Doctor, a sleep-consultation service. She's helped many babies with this problem, including her own daughter when she was 5 months old.