Your 5-Month-Old Baby: Grabby Hands, Longer Nights
A 5-month-old baby is the quietest month of the first half-year, and that is not an insult. The four-month sleep upheaval usually starts settling, nothing dramatic is scheduled — no well visit, no vaccines for most babies — and what you get instead is a baby who grabs, rolls, drools and shrieks with delight at the ceiling fan. Solids are close but usually not here yet. Here’s what’s normal at five months, what changes, and what’s worth a call.
Month five, in one line: everything goes in the mouth
Five months is when hands become genuinely useful and the mouth becomes the primary research instrument. She reaches for what she wants with something approaching aim, transfers a toy from one fist to the other with variable success, and puts it straight in her mouth to find out what it is. That’s not hunger and it’s not automatically teething — mouthing is how babies this age gather information.
Rolling often goes both ways this month, which changes the physics of your house. A baby who can roll can no longer be left on a bed, a sofa, or a changing table for even the second it takes to reach for a wipe. Sitting starts appearing in draft form: propped forward on her own hands in a wobbly tripod, upright for a few seconds, then a slow topple.
The noise changes too. Squeals, raspberries, and long strings of experimental vowels aimed directly at your face. She turns to her name sometimes, laughs at things that aren’t funny, and has strong opinions about being put down.
Milestones at five months
Worth saying plainly: there is no CDC five-month checklist. The CDC’s milestone checklists land at 2, 4, 6 and 9 months in the first year — five months sits in the gap. Any list you find online headed “5-month milestones” is someone interpolating between the four- and six-month checklists, and it’s more honest to treat it that way.
So the useful frame is a bracket. Behind you, from the four-month list: steady head control, pushing up on forearms, holding a toy, hands to mouth, chuckling, cooing back at you. Ahead, on the six-month list: rolling tummy-to-back, pushing up on straight arms, leaning on hands to sit, laughing, taking turns making sounds, blowing raspberries, reaching to grab a toy she wants, and putting things in her mouth to explore them.
A five-month-old is somewhere in that stretch, and where exactly is not a grade. Betteroo’s five-month development guide covers the same window. If something on the four-month list still isn’t there, that’s a call rather than a crisis — the CDC’s own advice is to act early and ask rather than wait and watch.
Sleep at five months
For most families this is a recovery month. If the four-month unravelling hit you, the wakings usually start consolidating again as your baby gets used to her new sleep architecture. Total sleep across a day sits in the twelve-to-sixteen-hour range including naps, per the sleep guidance the AAP endorses, and naps often begin organising into something you could almost call a pattern — commonly three a day at this age, with the last one short and late.
Two five-month sleep specifics. First: a baby who can roll will roll in her sleep, and once she can roll both ways on her own you don’t have to flip her back all night. She still goes down on her back, every sleep, in her own bare crib — that part never changes — but you’re not required to police her position once she gets there. Second: leg-in-the-slats, stuck-on-her-front, furious-at-3am is extremely common this month and passes as the skill matures.
Temperature is the other quiet culprit at five months, especially as she starts moving around the crib and shedding whatever you put on her. Betteroo has a sane walkthrough of what to actually put a baby in for sleep, which is more useful than the tog charts suggest. Loose blankets stay out of the crib for the whole first year.
Feeding at five months
Still milk. Breast milk, formula, or both, on cue, and it is still supplying essentially all of her nutrition. Current AAP guidance points to around six months for starting solids, and the gate is readiness rather than the date on the calendar: sitting upright with support, steady head control, real interest in what you’re eating, and the ability to move food from a spoon to the back of her mouth instead of pushing it straight out with her tongue.
Five months is exactly when those signs start appearing, which is why this is the month people start asking. The honest answer is that it’s a pediatrician conversation, and a short one — bring it up rather than deciding alone. If your baby is showing every sign, some pediatricians will say go ahead now; others will say wait a few more weeks. Both are ordinary answers.
The drool is not evidence of readiness, incidentally. Five-month drooling is a salivary-gland and mouthing thing far more often than a teething thing, and teeth can be months away yet.
Call the pediatrician if…
Call for: a fever of 100.4°F (38°C) or higher; a baby much harder to rouse than usual, floppy, or unusually limp; feeding that weakens or stops, or wet diapers dropping below her normal; labored breathing — fast, grunting with each breath, ribs pulling in — or blue lips or face; forceful projectile vomiting, or vomit that’s green or bloody; crying that’s high-pitched, pained, or truly inconsolable and unlike her; no laughing, no eye contact, or no response to sounds and voices; head control or rolling that seems to have gone backwards; a body that stays stiff or floppy; a strong and persistent preference for one hand or one side; or your gut telling you she’s off. Anything smaller than that goes on the list for the six-month visit — that’s what the appointment is for. And for you: a mood that stays dark or frightens you is a same-day call to your OB or the PSI helpline, at any point in the first year.
FAQ: your 5-month-old
Should a 5-month-old be sleeping through the night?
Some do; plenty don’t, and night feeds at five months are still normal. Most families see the four-month disruption settling this month into a longer first stretch and one or two wakes. Anyone quoting you a twelve-hour standard for a five-month-old is describing a marketing claim, not a milestone.
Can I start solids at 5 months?
AAP guidance points to around six months with readiness signs as the gate, and five months is genuinely early for most babies. If yours is sitting supported, holding her head steady and lunging at your dinner, raise it with your pediatrician rather than starting on your own.
Is my 5-month-old teething?
Usually not yet, even with the drooling and the constant fist-chewing — both are ordinary five-month behavior on their own. First teeth commonly arrive later in the first year, with a wide normal range. Fever, refused feeds or real distress are pediatrician territory, not teething assumptions.
What comes after five months?
The big one. Half a year brings sitting, the start of solids and a genuinely different daily rhythm — your 6-month-old is the month the first year splits in two. If you want to see how far you’ve come, go back to the three-month post and count. You’re doing fine.
