Your 5-Week-Old: Social Smiles Are Coming

A 5-week-old baby is standing on the doorstep of the good stuff: real social smiles and first coos typically arrive around six to eight weeks, and week five is when many babies start rehearsing — longer eye contact, mouth movements that almost organize into sounds, a face that lights up a beat before it knows what to do about it. The catch: this is also the final climb of the crying curve, which peaks around week six. So this week is genuinely both things at once — the fussiest stretch of the whole newborn arc and the week the payoff starts loading. Here’s what’s normal.

The almost-smile era

Watch her during a calm alert window and you can see the social software installing. Five-week-olds commonly hold your gaze for long, serious stretches, still or brighten at your voice, and start the open-mouthed, whole-face effort that’s a smile’s dress rehearsal. Some babies land the real thing this week; most debut between six and eight weeks. You’ll know it from the gas-smirk era because it happens while she’s awake, aimed at a person, usually in response to your face or voice — a served smile, not a leaked one.

You can encourage the rehearsals without a curriculum: close-range face time (her sharp focus is still roughly arm’s length), exaggerated expressions, pauses after you talk as if she might answer. Sometimes, increasingly, something answers back — early coos often start surfacing around now or soon after. Narrating your day at her like a friendly lunatic remains the developmentally optimal strategy.

Motor-wise: steadier (still wobbly) head lifts in supervised tummy time on a firm surface, less random startling, hands discovering that they exist and occasionally reaching her mouth by luck. All curriculum, no equipment.

Crying: near the summit

The fussiness that’s been building since week three is close to its documented peak — normal infant crying typically crests around week six, evening-heavy, sometimes immune to your whole repertoire. If the witching hour is currently your family’s main cultural event, that’s the curve, not your technique. Keep the rotation going — motion, sucking, snug carrying or a wrap, white noise, dim evening lights, a change of air — and keep expectations honest: each tool buys minutes. The approved pressure valve stands: a crying baby safe in her bare bassinet while you take five minutes elsewhere is textbook care, and if you’re trading off with a partner, handing off in shifts works as well at week five as it did on night one.

The other side of the mountain is real. From around week six onward, average crying declines — not to zero, but noticeably, steadily, and in your lifetime.

Sleep and feeding this week

Sleep may be showing its first signs of organization — some five-week-olds serve up one slightly longer stretch at night as the circadian clock comes online — but short cycles and around-the-clock feeds are still fully normal. No schedule is required or realistic yet; bright, social days and dark, boring nights remain the entire strategy. Feeding continues on cue, growth spurts continue to ambush, and the safe-sleep floor doesn’t move: on her back, in her own bare bassinet or crib, firm flat surface, nothing else in it — per the AAP, every sleep, including the desperate 4am ones.

Call the pediatrician if…

Peak-fussiness season makes the exceptions matter more, not less. Call for: fever of 100.4°F (38°C) or higher — urgent at this age, any hour; crying that’s high-pitched, pained, or truly inconsolable and unlike her usual; feeding that stops or fades (refused feeds, weak suck, too sleepy to eat); wet diapers dropping off; hard-to-wake sleepiness or floppiness; labored breathing — fast, grunting with every breath, ribs pulling in; blue lips or face; forceful projectile vomiting; or a baby who has stopped doing things she’d started (less eye contact, less response to sound). And always: “she seems off” is a complete reason to call, at any hour a nurse line is standing by.

FAQ: your 5-week-old

When will my baby actually smile at me?

Most babies serve their first true social smile between six and eight weeks — awake, aimed at you, triggered by your face or voice. Five-week rehearsals (long gazes, almost-smiles) mean it’s close. If smiles and eye contact haven’t shown up by the two-month checkup, that’s simply a thing to mention there.

Why is my 5-week-old crying more than ever?

Because normal infant crying peaks around six weeks, and week five is the last stretch of the climb. Evening-heavy, sometimes unexplained crying at this age is the curve behaving normally — the call-the-pediatrician list above covers the exceptions.

Should my 5-week-old be sleeping longer at night yet?

Maybe one slightly longer stretch; maybe not yet. Both are normal at five weeks. The body clock is only starting to come online — keep days bright and nights boring, and let week six and beyond do the consolidating.

What comes after week five?

Week six: the official crying summit, a likely growth spurt, and — as consolation — the strong odds of a first real smile. Same floor as always: feed on cue, sleep safe, lower the bar. You’re doing fine.