Full Extinction

Full extinction, often called “cry it out” or unmodified extinction, is the most decisive method on this site: you put your baby down awake after the bedtime routine and do not return to the room for crying, at bedtime or overnight, until a pre-agreed feed time (if you are still feeding overnight) or morning. There is no check-in schedule to track, which is both the entire appeal and the entire difficulty.

How it works, night by night

Complete your normal wind-down, place your baby in the crib awake, and leave. A baby monitor stays on the whole time, because the plan only ever covers ordinary protest crying, never a genuine problem: illness, an arm caught in the crib slats, vomiting, anything that would make any parent go back in regardless of a plan. Short of that, you do not re-enter for bedtime crying or for overnight waking crying, until morning or an agreed feed. There is no lengthening interval to calculate, no chair to move, nothing to fade. It is the same plan on night one as night five.

What the evidence actually says

The largest review of behavioral sleep interventions, an American Academy of Sleep Medicine task force analysis of 52 studies, gave unmodified extinction its strongest evidence rating of the approaches it assessed, alongside preventive parent education; across the studies reviewed, 94% found behavioral approaches efficacious, with over 80% of treated children showing improvement that was still holding 3 to 6 months out. A separate randomized trial comparing behavioral sleep interventions found no increase in stress-hormone (cortisol) levels in the treatment group relative to a no-treatment control, and a five-year follow-up study of a related cohort found no measurable long-term harm, and no measurable long-term benefit, to child emotional wellbeing or the parent-child relationship by age six. Full citations are on the comparison page.

Who tends to pick this method

Parents who have already tried a slower, gentler approach without success, or who have talked with their pediatrician and decided the shortest total number of hard nights matters more than avoiding any single hard night, tend to land here. It is also the method some caregivers recommend by default from experience with older children; that is not the same thing as it being the right first method for every family, which is exactly what the fit quiz is built to sort out.

Where it goes wrong

The most common failure mode is going in partway through a hard night. It is an understandable instinct, and it does not make anyone a bad parent, but intermittently reinforcing the crying tends to extend the plan rather than end it sooner, so a partial attempt often produces the worst of both approaches: the same distress with none of the typically-reported 3-to-5-night resolution window. The second failure mode is starting during the wrong week: a genuine sleep regression, teething, illness, or a recent move are all good reasons to wait, for this method most of all, since there is no built-in check to reassure you (or your baby) that anything unusual is being noticed.

If full extinction still feels right for your family after reading this, the plan builder will generate a printable version with your actual bedtime and a feed-time cutoff if you’re still feeding overnight.

This page is educational, not medical advice. Do not start structured sleep training before 4 months, and talk to your pediatrician first if your baby was premature, has reflux, or any health condition. See our methodology for how this site is sourced and reviewed.