There’s no single safe number of minutes that applies to every baby. The answer depends almost entirely on your baby’s age and the situation. For newborns under three months, the guidance is clear: respond promptly every time. For older babies, particularly those four to six months and beyond, some crying during sleep training is normal and typically lasts a few minutes to under an hour, decreasing over several nights.
Why Age Changes Everything
Babies under three months don’t have the neurological ability to regulate their own emotions. They can’t self-soothe because the brain systems responsible for calming down simply aren’t developed yet. Responding quickly during these early months doesn’t spoil your baby. It actually reduces total crying over time, because the baby learns that their needs will be met. The American Academy of Pediatrics is direct on this point: you cannot spoil a young baby with attention.
Around three to four months, babies begin developing the earliest capacity to settle themselves, though it remains limited. This is why most sleep training methods recommend waiting until at least four months, and some pediatricians suggest waiting until six months.
Normal Crying Is More Than You’d Expect
Before worrying about how long to let your baby cry, it helps to know how much healthy babies cry in general. Crying peaks at about two months of age. At that peak, some babies cry one to two hours a day, while others cry up to five or six hours. This wide range is completely normal and doesn’t mean something is wrong.
Pediatric researchers call this the Period of PURPLE Crying, a phase that typically starts around two weeks, peaks at two months, and gradually decreases between three and five months. The crying often clusters in the late afternoon and evening, resists soothing, and can start and stop without any obvious reason. Knowing this phase exists can help you avoid the trap of thinking your baby’s crying means you’re doing something wrong.
Sleep Training: What the Methods Actually Look Like
If your baby is old enough for sleep training (generally four to six months or older), the two most common approaches involve different amounts of crying.
Graduated extinction (the Ferber method) has you put your baby down awake and leave the room, then check in at increasing intervals. The first night, you wait about three minutes before briefly checking in. The second night, you start at five minutes. Each night the intervals stretch longer. You don’t pick the baby up during check-ins. You offer brief verbal reassurance and leave again. In one study, babies using this method fell asleep 13 minutes faster and spent 44 fewer minutes awake during the night compared to before training started.
Full extinction (cry it out) means putting your baby down and not returning until morning, unless something is clearly wrong. This tends to involve more intense crying on the first night or two but often resolves faster overall.
Bedtime fading is a gentler option where you gradually shift your baby’s bedtime later to align with when they naturally fall asleep, then slowly move it earlier. Babies in studies using this method fell asleep about 10 minutes earlier but didn’t wake up less often during the night.
How Long the Crying Actually Lasts
With graduated extinction, parents often report the worst crying on nights one and two, sometimes lasting 30 to 60 minutes. By night three or four, most babies cry significantly less. Within a week, many babies fuss for under 10 minutes before falling asleep. The trajectory matters more than any single night. If crying is decreasing night over night, the process is working.
With full extinction, the first night can involve longer stretches of crying, sometimes over an hour. But because there are no check-ins to restart the cycle, some babies actually resolve faster with this approach. It’s harder on parents, though, and isn’t right for every family.
Does Crying During Sleep Training Cause Harm?
This is the question parents really want answered, and the research is genuinely mixed. One widely cited study measured cortisol (a stress hormone) in babies going through sleep training and found that levels actually decreased by the end of training, suggesting the babies were less stressed once they learned to fall asleep independently.
However, a 2023 review in The Journal of Pediatrics raised concerns that most studies supporting sleep training haven’t adequately examined potential effects on attachment, stress regulation, or breastfeeding outcomes. The review also noted that parental anxiety can sometimes increase during the process, particularly with extinction methods. The honest summary: short-term sleep training in healthy babies older than four months has not been shown to cause lasting psychological harm in the studies we have, but the research has real gaps.
When Crying Signals Something Medical
Most crying is normal communication, not a sign of illness. But certain patterns warrant a call to your pediatrician or a trip to the emergency room:
- Sudden onset of intense, persistent crying in a baby who was previously calm, especially if they seem to be in pain
- High-pitched or unusual-sounding cries that are distinctly different from your baby’s normal crying
- Crying with fever, vomiting, or refusal to eat
- Unexplained injuries or swelling, particularly in the groin area
- A rapidly growing head or a bulging soft spot
Some of the conditions behind sudden-onset crying include trapped hernias, intestinal problems, infections, or even a hair wrapped tightly around a finger or toe (called a hair tourniquet). These are uncommon but worth knowing about because they’re easily missed and need prompt treatment.
The Effect on Parents Matters Too
Prolonged infant crying takes a real toll on parental mental health. Research shows a direct relationship between increased crying in the first six weeks and rising maternal depressive symptoms. In some cases, persistent crying can trigger or worsen postpartum depression. Depression then creates a feedback loop: mothers with higher levels of depression perceive their baby’s cries as less urgent and are less responsive to changes in cry patterns, which can lead to more crying.
Brain imaging studies have confirmed this isn’t just a matter of perception. Depressed mothers show reduced activation in the brain regions responsible for emotional response when hearing their baby cry. If you find that your baby’s crying is pushing you toward feelings of hopelessness, rage, or detachment, that’s important information about your own health, not a reflection of your parenting.
If your baby won’t stop crying and you feel overwhelmed, placing them in a safe space like a crib and stepping away for a few minutes is not neglect. It’s a recommended safety strategy. Babies can cry safely in a crib. The same is not true for a baby being held by a parent who has reached their breaking point.