Actually, in her problem solving book she says you can start the cluster feed/dream feed as soon as you bring the baby home from the hospital. However, we found in the first 2 weeks that while our baby was eager to eat at cluster feeds, his little tummy wasn't big enough to hold it. She says if the clusters don't work, concentrate on the dream feed. That's what we've been trying to do (altho we still aren't getting the dream feed right yet! However, since our baby will sleep from 12 am-4:30 am, I guess I shouldn't complain!)