The 5 S's: how to calm a crying newborn

Dr. Harvey Karp's 5 S's method (from "The Happiest Baby on the Block") is the most widely-taught newborn soothing technique. It works because each S mimics a sensation from the womb — and triggers what Karp calls baby's "calming reflex." Here is the practical version, what each S does, and the order that gets results.

Why babies cry

Newborns cry an average of 2 to 3 hours a day in the first 6 weeks. Most of that crying isn't because something is wrong — it's because newborns are essentially "fourth trimester" creatures, finishing development outside the womb. They don't yet have the tools to self-soothe. Crying is communication and a release.

The 5 S's work by activating a primitive calming reflex newborns are born with. This reflex evolved to keep small humans quiet when a predator was near. In modern terms: it shuts off crying within minutes, reliably, in most newborns under 3 months.

The 5 S's, one by one

S1: Swaddle

What it does: Wraps baby's arms snugly across their chest. Mimics the snug feel of the womb. Prevents the startle reflex from waking them.

How to do it: Use a Velcro or zip-up swaddle for speed. Or wrap a muslin square — diamond shape, top corner folded down to shoulder level, baby on top, fold the right corner across body and tuck under back, fold the bottom up loose around legs, fold the left corner across and tuck. Snug at chest, loose at hips.

What to know: Arms across chest, not pinned at sides if baby resists. Legs must bend up and out (no straight-leg wraps). Stop swaddling once baby shows signs of rolling, around 8 to 12 weeks.

S2: Side or stomach hold

What it does: Holds baby on their side or stomach across your forearm. This is a soothing position only — never for sleep, where back-only is the rule.

How to do it: Place baby on your forearm with their head supported in your hand and their body resting along your arm, belly-down or side-down. Their face turns slightly away from your chest.

What to know: This is for awake soothing. The moment baby falls asleep, transfer to back-on-flat-surface sleep position.

S3: Shush

What it does: Makes a loud, continuous "shhhh" sound near baby's ear. Mimics the in-utero sound of blood flow and amniotic fluid — louder than a vacuum cleaner.

How to do it: Lean close to baby's ear and shush continuously, loud enough that you'd have to raise your voice to be heard over it. As baby calms, you can quiet the shush. Increase volume if baby is escalating.

What to know: Most parents shush too quietly. The womb was loud. Don't whisper-shush a crying newborn.

S4: Swing

What it does: Tiny, jiggly movement of baby's head and body. Mimics the constant motion of walking with a baby in utero.

How to do it: While holding baby in the side/stomach position with their head supported, do very small jiggle motions side to side (1 inch or so). Tight, fast, controlled — never shake. Think "vibration," not "swing."

What to know: This is small-amplitude, high-frequency movement. Never shake a baby in anger or with significant force — shaken baby syndrome is a real and dangerous injury. The 5 S's swing is a controlled, gentle jiggle. If you can't tell the difference and you're feeling overwhelmed, put baby down safely and walk away for a minute.

S5: Suck

What it does: Activates the suck-soothing reflex. The most effective S for many babies, especially once the first 4 have calmed them.

How to do it: Offer breast, bottle, pacifier, or clean finger. Let baby suck for as long as they want.

What to know: For breastfeeding, wait until breastfeeding is established (3 to 4 weeks) before offering a pacifier as a soothing tool. A clean finger (your finger, pad up) is a workable substitute in the early weeks.

The order matters

The 5 S's are most effective when used together and in order. The progression is:

1. Swaddle baby (or check they're already swaddled).
2. Hold them in side/stomach position across your arm.
3. Shush loudly near their ear.
4. Add the jiggle motion.
5. Offer suck (breast, paci, finger).

Start with all five at once for an inconsolable baby. As baby calms, slowly back off — dial down the shush, soften the jiggle, then transfer to a calm hold. Total time: 1 to 5 minutes for most newborns.

When the 5 S's don't work

Sometimes baby still cries through it. The most common reasons:

The baby is hungry

The 5 S's don't fix hunger. If it's been 2+ hours since the last feed, try feeding first. Then 5 S's for any residual fussiness.

The baby is overtired

If wake windows have stretched too long, baby is too cortisol-flooded to calm easily. The 5 S's still help eventually, but it takes longer. Going forward, shorten the next wake window by 15 minutes.

The baby has a dirty diaper

Check this before anything else. A wet diaper is uncomfortable.

The baby has gas or reflux

Stomach pain doesn't respond well to the 5 S's. Try paced bottle feeding, smaller more frequent feeds, keeping baby upright after feeds, and bicycling baby's legs. See our newborn gas relief guide.

The baby is sick or in pain

A cry that sounds different from baby's usual — higher-pitched, more intense, more sustained — and is paired with fever, refusal to feed, vomiting, or floppiness needs a pediatrician call.

The witching hour and the 5 S's

Most newborns have a fussy stretch in the late afternoon/early evening (the witching hour). This is biological — not anything you caused — and it peaks around 6 weeks of age. The 5 S's are the best tool for getting through it, but they may need to be repeated and sustained for an hour or more. See our witching hour article for more.

Safe alternatives if you're overwhelmed

If you've tried the 5 S's, fed, changed, and nothing's working, and you're starting to feel overwhelmed:

1. Put baby down in a safe place (crib, bassinet, play yard with nothing in it).
2. Step away for 5 to 10 minutes. Walk into another room. Take deep breaths. Drink water.
3. Reset and try again, or hand off to your partner.

It is always safer to put baby down crying for a few minutes than to shake or harm them. If you reach a moment of feeling out of control, that's a real emergency — call your provider, call a crisis line, or text a friend.

What 5 S's aren't designed for

• Older babies (over 3 to 4 months). The calming reflex fades. Other soothing strategies start working better.
• Sleep training. The 5 S's calm crying, but using them for every nap can create a sleep association baby needs to break later.
• Replacing feeds. Don't use the 5 S's to delay a real hunger cue.

When to call your pediatrician

• Baby cries inconsolably for more than 2 to 3 hours straight, especially with other symptoms (fever, vomiting, refusing to feed).
• Baby's cry sounds notably different from usual — higher-pitched, weak, or sustained without breath.
• Baby seems to be in pain (arched back, clenched fists, hard belly).
• Baby has fever over 100.4 F.
• You suspect colic (defined as crying 3+ hours a day, 3+ days a week, for 3+ weeks).
• You are feeling unsafe with your baby. This is always urgent — call provider or crisis line.