How To Soothe A Fussy Newborn Using The 5 Ss? Key Facts

Crying is how a newborn communicates. The 5 Ss are five soothing techniques — swaddling, side or stomach position, shushing, swinging, and sucking — that aim to calm a fussy baby by recreating some of the sensations of the womb. They are widely used by parents and taught by many newborn care educators, though the strongest supporting research comes from one pediatrician’s body of work rather than from large independent trials.

The approach was developed by pediatrician Harvey Karp, who described it in his book The Happiest Baby on the Block. The idea is that human babies are born relatively immature compared with other mammals, and the 5 Ss mimic the tight containment, constant sound, and motion a baby experienced before birth. Many parents find the techniques helpful. The evidence base is real but limited, and I will be clear about where it is strong and where it is not.

What Are the 5 Ss and How Do They Work?

Each S targets a different sensory system. Used together, they can calm many newborns, especially in the first three to four months of life. After that, babies often outgrow their response to them.

• Swaddle — snug wrapping that limits the startle reflex, which frequently wakes newborns.
• Side or stomach position — holding the baby on their side or stomach while awake and supervised, which many babies find calming.
• Shushing — a loud, steady “shhh” sound that resembles the rushing blood flow and noise a baby heard in the womb.
• Swinging — small, rhythmic movements, not big ones.
• Sucking — a pacifier, a clean finger, or the breast or bottle, which triggers a calming reflex in many babies.

One clarification worth knowing: the side or stomach position is a soothing hold only. It is never a sleep position. Babies must always be placed on their back to sleep. This is one of the most consistent and well-established safety recommendations in infant care, and it applies no matter how well a baby settles on their side while awake.

How Do You Swaddle a Newborn Safely?

Swaddling works by containing the arms so the startle reflex — the sudden jerking of arms and legs that can wake a baby — is less likely to disturb them. It is one of the better-supported of the 5 Ss for helping newborns settle.

Use a thin, breathable blanket or a purpose-made swaddle. Wrap snugly around the arms and torso, but keep the hips loose enough that the legs can bend up and out. Tight, straight-leg swaddling has been linked to hip problems, so the legs should be able to move. The chest should be snug, but you should be able to slip a hand between the blanket and the baby’s chest.

Safety points that matter:

• Stop swaddling once a baby shows signs of rolling over. A swaddled baby who rolls onto their stomach cannot easily push back, which raises suffocation risk.
• Never swaddle so tightly that the baby cannot breathe comfortably, and never cover the face or head.
• Do not overdress a swaddled baby. Overheating is a known risk factor for sleep-related infant death, so use fewer layers under the swaddle and check the baby’s chest and neck for heat.
• Swaddling is for sleep and calming. Once a baby is awake and active, unwrap them so they can move their arms and legs.

The American Academy of Pediatrics has supported swaddling as a calming technique while emphasizing back-sleeping, hip-safe wrapping, and stopping once rolling begins. If you are unsure about your baby’s hip position, ask your pediatrician.

Why Does the Side or Stomach Hold Calm Some Babies?

Many newborns settle when held on their side or stomach against an adult’s chest or forearm. The change in position seems to reduce the startle response and gives the baby a sense of containment. This is a soothing hold, done while the baby is awake and supervised.

The critical rule: this position is for calming only, never for sleep. Put the baby down on their back every time. The back-to-sleep recommendation is one of the most strongly supported safety measures in infant care and has been associated with a large drop in sleep-related infant deaths since it was widely adopted in the 1990s.

If a baby is very fussy, some parents find that holding them on their side against the chest while shushing and gently bouncing helps. Keep a firm hand on the baby and never leave them unattended in this position.

Does Shushing Really Work?

Shushing works for some babies because it mimics the constant noise of the womb. In the uterus, a baby hears the mother’s heartbeat, blood flow, and digestion — a steady, fairly loud sound. A quiet room can feel unfamiliar by comparison.

The shush should be louder than you might expect — roughly as loud as a running shower or a vacuum cleaner, but never directly into the ear. Some parents use a white noise machine for sleep. If you do, keep the volume moderate and place the machine several feet from the crib, not next to the baby’s head. There is no strong evidence that white noise is harmful at reasonable volumes, but very loud or prolonged exposure near the ear is best avoided.

Shushing is not a guaranteed fix. Some babies respond to it immediately; others do not. If it does not work, that is not a sign anything is wrong with your baby or your technique.

How Much Swinging Is Safe?

Newborns often calm with small, rhythmic motion — a gentle bounce, a slow sway, or a short walk. The motion should be gentle. Never shake a baby, and never swing a baby by the arms or legs. Shaking can cause serious injury, including brain damage.

Some parents use swings, bouncers, or car rides. These can help, but a few cautions apply. Never leave a baby asleep in a car seat, swing, or bouncer for an extended period; babies can slump into a position that makes breathing harder. If a baby falls asleep in a device, move them to a firm, flat sleep surface on their back.

Motion helps some babies and does nothing for others. There is no evidence that a specific type or amount of swinging is required. Gentle and brief is the guiding principle.

When Should You Offer Sucking?

Sucking is a strong calming reflex in newborns. A pacifier, a clean finger, or feeding can all settle a fussy baby. Sucking is one of the more reliably effective of the 5 Ss for many infants.

A few practical points. If you are breastfeeding, some clinicians suggest waiting until breastfeeding is well established before introducing a pacifier, though guidance on timing varies and this is a matter of clinical judgment rather than a firm rule. Never force a pacifier, and never dip it in honey or sugar — honey is unsafe for infants under 12 months because of the risk of infant botulism. Some parents use a pacifier at naptime and bedtime, and this is generally considered acceptable.

Do the 5 Ss Work for Every Baby?

No. The 5 Ss help many newborns, but they are not a universal solution. Some babies calm quickly with swaddling and shushing; others seem unaffected. Response varies, and that is normal.

The research behind the 5 Ss is largely observational and comes from a relatively small number of studies, much of it associated with the technique’s developer. That does not mean the techniques are ineffective — many parents and clinicians report good results — but it does mean the evidence is not as strong as it is for, say, back-sleeping or car seat use. Treat the 5 Ss as a set of tools to try, not a guaranteed method.

It also helps to know that newborn crying typically peaks around six to eight weeks of age and then gradually declines. That pattern is well documented and is not a sign of poor parenting.

When Should You Call a Doctor About a Fussy Newborn?

Soothing techniques address normal fussiness. Some crying needs medical attention. Contact your pediatrician promptly if a baby:

• Has a fever. For infants under 3 months, a rectal temperature of 100.4°F (38°C) or higher is a reason to seek care right away.
• Cries inconsolably for long stretches and cannot be settled by any method.
• Feeds poorly, vomits forcefully, or has fewer wet diapers than usual.
• Seems unusually limp, floppy, or difficult to wake.
• Has a change in breathing, a rash, or signs of pain.

Persistent, intense crying in an otherwise healthy baby can sometimes be colic, which is common and usually improves with time. But it is worth having a pediatrician rule out other causes. Never feel you are overreacting by calling — that is what the visit is for.