When can I begin using a pacifier?

It is recommended that pacifiers and other types of artificial nipples be avoided for at least the first 3-4 weeks. I’d personally suggest that most breastfed babies – if they get a pacifier at all – would be better off without a pacifier until mom’s milk supply is well established (6-8 weeks, usually) and the 6 week growth spurt is over. That way you’ve established a good milk supply and don’t lose any much-needed breast stimulation to a pacifier.