Baby Sleep Training Methods: Ferber vs. Cry It Out

Key Takeaways

• Most babies are ready for sleep training at 4-6 months
• Ferber uses timed check-ins; CIO leaves baby until morning
• Research shows no harm to attachment from either method
• Gentler options (chair, pick-up/put-down) take longer but involve less crying
• Consistency for 5-7 nights is essential to success

If you're researching baby sleep training methods, you've probably run into a passionate debate between the Ferber method and "cry it out" (CIO). Both are extinction-based techniques designed to teach babies to fall asleep independently, but they differ in important ways. This guide breaks down how each works, what the research says, and how to choose the right approach for your baby.

!Sleeping baby in a crib with a soft nightlight

When Is Baby Ready for Sleep Training?

Most pediatric sleep experts recommend waiting until your baby is 4-6 months old. By this age, most babies:

• Can sleep 6-8 hour stretches biologically
• Have outgrown the need for night feeds (check with your pediatrician)
• Have developed the self-soothing skills to learn independent sleep

Before 4 months, sleep is too disorganized for formal training. Focus instead on a consistent bedtime routine, full feeds, and a safe sleep environment.

The Ferber Method (Graduated Extinction)

Developed by Dr. Richard Ferber, this is the most popular of the baby sleep training methods. You put your baby down drowsy but awake and leave the room. If they cry, you wait a set interval before going in to briefly comfort them (no picking up, just a pat and a soothing word for 1-2 minutes).

A typical Ferber schedule looks like this:

• Night 1: Check at 3, 5, then 10 minutes
• Night 2: Check at 5, 10, then 12 minutes
• Night 3: Check at 10, 12, then 15 minutes

You continue extending intervals each night. Most babies are sleeping independently within 3-7 nights. The graduated approach reassures parents (and babies) that they aren't being abandoned.

Cry It Out (Full Extinction)

The "cry it out" method — also called full extinction or the Weissbluth method — is more intense. After a calm bedtime routine, you put baby down and don't return until morning (except for genuine safety concerns or scheduled feeds).

Proponents say it's faster (typically 2-3 nights) and avoids the "yo-yo" effect of checks that can re-stimulate the baby. Critics find the unbroken crying emotionally difficult, even though research shows no measurable harm to attachment or stress.

What the Research Says

A landmark 2016 study in Pediatrics compared graduated extinction, bedtime fading, and a control group. Both sleep training methods significantly improved sleep with no negative effects on parent-child attachment, infant stress, or behavior at 12-month follow-up. A 5-year follow-up published in 2012 found identical outcomes between trained and untrained children.

In short: among the baby sleep training methods studied, Ferber and CIO are equally safe and effective. The right choice comes down to parental comfort.

Gentler Alternatives

If extinction feels too hard, consider:

• Chair method: Sit next to the crib and gradually move farther away over 1-2 weeks.
• Pick-up/put-down: Pick baby up when they cry, soothe, then put down once calm. Repeat.
• Bedtime fading: Push bedtime later to a time when baby is genuinely tired, then gradually move it earlier.

These take longer (2-3 weeks) but involve less crying.

Tips for Success

• Commit to a consistent approach for at least 5-7 nights
• Both parents on the same page
• Solid bedtime routine 30-45 minutes before lights-out
• Dark, cool (68-72°F) room with white noise
• Don't start during illness, travel, or major transitions

When to Pause or Get Help

If your baby has reflux, sleep apnea, or is sick, hold off and treat the underlying issue first. If sleep training isn't working after 2 weeks of consistent effort, consult a pediatric sleep consultant or your pediatrician. Whichever of the baby sleep training methods you choose, remember: better sleep helps the whole family, including your baby.

Frequently Asked Questions

What are the main baby sleep training methods?

The most common are Ferber (graduated extinction), cry it out (full extinction), the chair method, pick-up/put-down, and bedtime fading.

Is sleep training harmful to babies?

Multiple studies — including long-term follow-ups — show no negative effects on attachment, stress, or behavior in babies who were sleep trained.

How long does sleep training take?

Ferber and CIO typically work within 3-7 nights. Gentler methods take 2-3 weeks.

Related articles

• Best Baby Swaddles for Better Sleep
• The Complete Newborn Sleep Schedule: Your Guide to the First 12 Weeks
• Baby Teething Symptoms and Relief: What Works
• Is It a Newborn Sleep Regression? Signs in the First 3 Months

References

1. Gradisar M et al. (2016). Behavioral Interventions for Infant Sleep Problems. Pediatrics.
2. Price AMH et al. (2012). Five-Year Follow-up of Harms and Benefits of Behavioral Infant Sleep Intervention. Pediatrics.