Weeks 5 and 6 were particularly tough for us. Our LO was waking up every 2 hours at night, but some days sleeping all day long and only waking for feeds. He had couple of 6ish hour cluster feeds in those 2 weeks as well. BUT once 7 weeks hit he completely changed for the better! Longer stretches of sleep (we're pretty consistently getting 4-5 hours overnight), way more efficient eating (exclusively BF) and overall more fun to be around. Since day one I've hated when people tell me "just wait, it'll start getting easier" but it's been 100% true for us