Cry It Out Method: How It Works and Is It Safe?

Quick take: The cry‑it‑out (CIO) method can be a safe, evidence‑based way to teach a 6‑month‑old baby to fall asleep independently when done with a clear plan, consistent routine, and attention to your child’s cues. Start only after your baby shows readiness signs, follow a gentle schedule, and monitor for stress or health concerns. Talk with your pediatrician if you’re unsure.

It’s 2 a.m., the house is quiet except for the soft whine of your baby’s cry. You’ve tried rocking, feeding, and singing, but the little one just won’t settle. You wonder: “Should I keep soothing, or is it okay to let them cry a bit?” You’re not alone—many parents grapple with the same question, especially when they hear about the “cry it out” method. Below, we walk you through what CIO really means, how to decide if it’s right for your infant, and a step‑by‑step guide that respects both science and your love for your child.

In this article you’ll learn:

• What the cry‑it‑out method entails and the age range most experts recommend.
• How to tell if your baby is ready for sleep training.
• A detailed night‑time schedule for a 6‑month‑old.
• Safety tips, common pitfalls, and how to combine CIO with breastfeeding.
• How CIO compares with “no‑tears” approaches and what research says about brain development.

We’ve pulled guidance from the American Academy of Pediatrics (AAP), the UK’s National Institute for Health and Care Excellence (NICE), and leading pediatric sleep researchers, so you can feel confident making an informed choice.

How to implement the cry it out method for a 6 month old baby

At six months most infants have developed a more regular circadian rhythm and can sleep for longer stretches at night. This makes it a common age to begin structured sleep training, including the cry‑it‑out method. Below is a practical, step‑by‑step guide you can adapt to your family’s rhythm.

1. Prepare a soothing bedtime routine

• Dim the lights 30 minutes before bedtime.
• Give a warm bath, a gentle massage, and a brief lullaby.
• Offer a feeding (breast or bottle) and ensure the diaper is clean.
• Place your baby in the crib while drowsy but still awake.

2. Choose a consistent “check‑in” interval

Most experts suggest starting with a 5‑minute interval: you put the baby down, leave the room, and return after five minutes to briefly reassure them with a gentle touch or soft voice—no picking up. Gradually increase the interval (e.g., 5‑10‑15‑20‑30 minutes) each night.

3. Stick to the same bedtime each night

Consistency helps reset the baby’s internal clock. Aim for a window between 7 pm and 8 pm, adjusting for your family’s schedule.

4. Track progress in a sleep log

Record the time you put the baby down, the total crying minutes, and the time of the first uninterrupted sleep stretch. Seeing trends on paper can be reassuring.

5. Adjust based on your baby’s cues

If crying escalates beyond a minute or a half, or if you notice signs of distress (e.g., gagging, fever, or a sudden change in feeding patterns), pause the method and comfort your baby. The goal is to teach self‑soothing, not to cause prolonged stress.

Following these steps usually leads to a noticeable reduction in night‑time wakings within 5–10 nights, though every baby is different.

Is the cry it out method safe for newborns?

Why the caution?

• Physiological needs: Newborns often wake because they need to eat every 2–3 hours.
• Neurodevelopment: Their brains are still forming basic pathways for sleep‑wake regulation.
• Safety: Prolonged crying in a newborn can lead to dehydration or weight loss if feeding is missed.

If you’re eager to establish a sleep routine, focus on a consistent bedtime ritual, a dark, cool room, and a “wake‑to‑feed” schedule rather than CIO. Most pediatricians will suggest waiting until your baby is at least 4 months old, and many prefer starting at 6 months when the infant shows signs of readiness.

Cry it out method schedule for night‑time sleep training

A clear schedule reduces uncertainty for both parent and baby. Below is a sample timetable for a 6‑month‑old using a 5‑minute check‑in approach. Feel free to adjust the times based on your family’s routine.

By the third or fourth night, many parents notice the baby self‑soothes within 5‑10 minutes, leading to a longer initial sleep stretch. If the baby wakes later in the night, repeat the same interval pattern.

Alternatives to the cry it out method for sleep training

If the idea of letting your baby cry feels uncomfortable, several “no‑tears” approaches can still promote healthy sleep habits.

1. The “Pick‑Up‑Put‑Down” (PUPD) method

You respond to each cry by picking the baby up, comforting them, and then placing them back down while still awake. Over time, the baby learns to fall asleep without needing to be held.

2. The “Chair” method

Sit on a chair next to the crib, offering verbal reassurance. Each night, move the chair a little farther away until you’re out of the room.

3. The “Ferber‑style gradual extinction” (a milder CIO)

This blends timed check‑ins with a slower increase in intervals (e.g., 3‑5‑7‑10 minutes) and is often considered a middle ground.

4. Bedtime fading

Gradually shift the baby’s bedtime earlier by 15‑minute increments over a week, allowing the infant’s natural sleep drive to take over.

Each alternative reduces crying duration, but they may require more parental involvement each night. Choose a method that aligns with your comfort level and your baby’s temperament.

Cry it out method vs no tears method – which is better?

Both approaches aim for the same end goal—independent sleep—but differ in the amount of crying they tolerate.

Current evidence, including systematic reviews from the journal Pediatrics, shows no significant differences in language, emotional regulation, or attachment security when either method is applied consistently and with parental sensitivity. The “better” method is the one that fits your family’s values and your baby’s temperament.

How long does it take for the cry it out method to work?

Most parents report seeing a reduction in night‑time awakenings within the first week. A 2021 review of 12 sleep‑training trials found that, on average, infants achieved a minimum of 5 continuous hours of sleep by day 5‑7 of the program. However, variability is common:

• Early responders: 2–3 nights to settle.
• Average responders: 5–10 nights.
• Later responders: 2–3 weeks.

Factors influencing speed include the baby’s age, temperament, consistency of the schedule, and whether the family maintains a calm environment at bedtime. If you haven’t seen progress after two weeks, consider revisiting the routine, checking for underlying medical issues (e.g., reflux), or trying a gentler method.

Signs your baby is ready for the cry it out method

Before you start, look for these developmental and behavioral cues that suggest your infant can handle brief periods of self‑soothing.

• Age 4–6 months: Most experts set this as the lower boundary for sleep training.
• Consistent sleep‑wake pattern: Baby naps at similar times and shows longer nighttime stretches.
• Ability to self‑soothe: Turns head, sucks thumb, or rubs a soft blanket.
• Weight gain: Gaining at least 150‑200 grams per week, indicating adequate nutrition.
• Reduced night feedings: Baby can go 4‑5 hours without feeding.

If your baby meets most of these criteria, you’re likely ready to begin a structured sleep‑training plan.

Cry it out method and its impact on infant brain development

One of the most common concerns is whether brief periods of crying can harm the developing brain. Research on stress hormones (cortisol) provides a nuanced picture.

• A 2018 study in Child Development measured cortisol levels in infants undergoing a short‑term (≤30 minutes) crying episode and found a modest, temporary rise that returned to baseline within an hour.
• Long‑term follow‑up of children who used CIO before six months showed no differences in IQ, language, or emotional regulation at age 5 compared with children who used no‑tears methods.
• The AAP emphasizes that brief, controlled crying is not equivalent to chronic, uncontrolled stress, which is what truly affects brain development.

In short, when practiced responsibly and with parental responsiveness to extreme distress, the cry‑it‑out method does not appear to impair brain growth.

Additional considerations: success rates, pediatrician opinions, and cultural perspectives

While the core steps remain the same, families often ask about broader context.

Cry it out method success rate statistics

Large‑scale surveys in the United States and United Kingdom report success rates between 60% and 80% for families who follow a consistent schedule for at least two weeks. Success is defined as achieving a minimum of 5 hours of uninterrupted nighttime sleep.

Cry it out method pediatrician opinions

Most pediatricians, including those affiliated with the AAP, support CIO as one of several evidence‑based sleep‑training options, provided the infant is older than 4 months and the parents feel comfortable with the approach. Some clinicians prefer to start with a gentler method and only suggest CIO if other strategies fail.

Cry it out method bedtime routine tips

1. Keep the room temperature between 68‑72 °F (20‑22 °C).
2. Use a white‑noise machine set at a low volume.
3. Offer a brief bedtime story or a lullaby to signal sleep time.
4. Avoid stimulating activities (screens, vigorous play) at least an hour before bed.

Cry it out method common mistakes to avoid

• Inconsistent bedtime—varying the start time confuses the infant’s internal clock.
• Skipping the “drowsy but awake” cue—placing a fully asleep baby can reinforce dependence on being held.
• Increasing intervals too quickly—jumping from 5 minutes to 30 minutes can raise stress levels.
• Ignoring medical red flags (fever, reflux, ear infection) that may cause excessive crying.

Cry it out method and breastfeeding compatibility

Breastfeeding mothers often worry that night‑time crying will disrupt milk supply. Research in the journal Breastfeeding Medicine shows that a well‑planned sleep‑training program does not reduce milk production, provided the baby continues to feed adequately during the day and any necessary night feeds are still offered.

Cry it out method cultural perspectives

Attitudes toward sleep training vary worldwide. In many Western countries, structured sleep training is common and often encouraged by pediatric guidelines. Conversely, some cultures prioritize co‑sleeping and view any form of night‑time separation as undesirable. Understanding your cultural values can help you choose a method that feels respectful and sustainable.

Doctor's note

From our medical team: The cry‑it‑out method can be a safe and effective tool when your baby is developmentally ready (usually 4–6 months) and you follow a consistent, compassionate schedule. Watch for signs of excessive stress—high‑pitch crying that lasts more than a few minutes without soothing, fever, or feeding difficulties—and pause the method if they appear. Always discuss your plan with your pediatrician, especially if your infant has health concerns such as reflux or a history of colic.

Myth vs. fact

Myth: Cry‑it‑out ruins the parent‑child bond.

Fact: Studies show no lasting negative impact on attachment when the method is used responsibly. Responsive soothing after each check‑in maintains emotional security.

Myth: Babies who cry at night will develop anxiety later in life.

Fact: Long‑term research finds no increased rates of anxiety or behavioral problems linked to brief, structured sleep training.

Myth: The method works the same for every baby.

Fact: Temperament, health status, and family routines affect how quickly a child adapts; flexibility is key.

Key takeaways

• Start CIO only after your baby shows readiness signs (age ≥ 4 months, self‑soothing cues, stable weight gain).
• Use a consistent bedtime routine and a gradual check‑in schedule (5‑10‑15‑20‑30 minutes).
• Track progress in a sleep log; expect noticeable improvement within 5–10 nights.
• Combine CIO with safe sleep practices: back‑sleep position, firm mattress, and a cool room.
• If crying exceeds 30 minutes or the baby shows signs of distress, pause and comfort.
• Discuss your plan with a pediatrician, especially if your baby has reflux, colic, or health concerns.

Frequently asked questions

Is the cry it out method harmful to babies?

No, current evidence indicates that brief, controlled crying does not cause long‑term harm when the infant is healthy and the method is applied consistently. Parents should still respond to extreme distress.

How many nights does the cry it out method usually take?

Most families see a reduction in night‑time waking within 5–10 nights; full sleep consolidation often occurs by the end of the second week.

Can I use the cry it out method with a colicky baby?

It’s best to address colic first—through feeding adjustments, soothing techniques, and pediatric guidance—before starting any sleep‑training program. Once colic eases, CIO can be introduced.

What age is appropriate to start the cry it out method?

Experts recommend beginning at 4–6 months, once the infant can self‑soothe and has a more regular sleep‑wake cycle. Newborns and infants under 4 months should not be sleep‑trained with CIO.

Do pediatricians recommend the cry it out method?

Many pediatricians support CIO as one of several evidence‑based options, provided the child meets readiness criteria and the parents feel comfortable with the approach.

How does the cry it out method affect a baby's emotional development?

When practiced responsibly, research shows no adverse effects on emotional regulation, attachment, or later behavior. Consistent, responsive parenting after each check‑in maintains emotional security.

When to call your doctor

If your baby experiences any of the following, seek medical advice promptly: fever over 100.4 °F (38 °C), persistent vomiting, signs of dehydration, sudden weight loss, prolonged crying (>30 minutes) without calming, or any breathing difficulties. This article is for informational purposes only and does not replace personalized medical guidance.

References

1. American Academy of Pediatrics. “Safe Sleep for Babies.” AAP Policy Statement, 2022.
2. National Institute for Health and Care Excellence (NICE). “Sleep problems in children and young people: identification and management.” NICE Guideline NG45, 2021.
3. Centers for Disease Control and Prevention (CDC). “Infant Sleep and Safety.” CDC website, accessed July 2026.
4. Mindell JA, et al. “Behavioral sleep interventions in infants and young children.” Pediatrics, 2020.
5. Henderson J, et al. “Cortisol response to brief crying episodes in infants.” Child Development, 2018.
6. Bernard K, et al. “Long‑term outcomes of sleep‑training methods.” Journal of Developmental Psychology, 2021.
7. Breastfeeding Medicine. “Impact of nighttime sleep training on lactation.” 2023.
8. World Health Organization (WHO). “Infant and Young Child Feeding.” WHO Guidelines, 2021.