3 for 3 sleeping through the night by 60 days. All we did was have a feeding schedule that we stuck to pretty closely, and around week 2 started intentionally delaying our response to night-time crying, gradually increasing how far we stretched it (start with maybe a minute, increase over time). They wake up at night and don’t know how to self-soothe back to sleep if you always jump in the second they make a sound, they don’t actually need night time feedings past the first few weeks, responding immediately trains them not to fall back asleep on their own if they stir at night (and everyone does). Down to one feeding at night by a month or so, none past two months.

Can’t say many other things worked equally well for all three kids, but that did.