The short answer
Before the birth, buy two or three sleepers and two or three bodysuits in newborn size, the same again in 0-3 months, and stop. Top up only when the baby is here and you know which size fits. Most babies are out of newborn size within three to six weeks, and some never wear it.
| Item | Before the birth | Full count, washing every other day | Worth knowing |
|---|---|---|---|
| Sleepers | 2 or 3 in newborn, 2 or 3 in 0-3M | Newborn 5 to 7; 0-3M 6 to 8 | Include a couple of footless styles for the gap between sizes |
| Bodysuits | 2 or 3 in newborn, 2 or 3 in 0-3M | Newborn 5 to 7; 0-3M 6 to 8 | If you buy only one type, make it long-sleeve |
| Hats | 2 | 2 | For outdoors in the cold. Off indoors, and never on a sleeping baby |
| Socks | 1 or 2 pairs | 1 or 2 pairs | Only for footless styles or inside a thin sleeper |
| Swaddles, if you use them | 3 to 4 | 3 to 4 | A short phase, so borrow if you can |
| Wearable blankets | 2 to 3 per TOG rating | 2 to 3 per TOG rating | A spare covers the night one gets soaked |
| Crib sheets | 3 | 3 | The item people under-buy |
| Blanket for car seat and stroller | 1 | 1 | Laid over the buckled harness. Never in the crib |
| Outerwear, cold climates only | 1, one size up | 1 | Never under a car seat harness |
Those counts match our separate guides on how many baby pajamas you need and newborn or 0-3 months, which show the reasoning at length. This page pulls them into one list you can shop from.
Why should you wait to buy the full count?
Because you cannot know the size until the baby has arrived, and newborn is the shortest-lived band in the range. A baby born near the average weight usually passes it in three to six weeks. A baby over about 8 lb at birth may skip it completely.
The size question also takes a while to settle. All newborns lose some weight in the first days, and they should be back at birth weight by about two weeks, so a sleeper that looks roomy on day three may not be the wrong size. Exchange nothing in that window.
Three habits keep the first month from turning into a drawer of unworn clothes:
- Keep the tags on anything you are not about to use. Retailers generally take back unworn clothing, not washed clothing.
- Trade duplicate newborn gifts for 3-6M. That is the size families tend to run short of, because gifts cluster on newborn.
- Top up in the size that fits, in the weeks you need it. What you bought before the birth, washed daily, will cover the few days that takes.
Our newborn clothes and baby bodysuits cover the core of the list. Check the size chart against the baby rather than the age on the label.
How do you change the numbers for your own laundry?
Run the formula, because laundry moves the answer more than the baby does:
Sets needed = (changes per day × days between washes) + 2
The extra two are one in the wash and one clean in the drawer. In the first weeks, expect two to three sleepwear changes across a day and night.
| You wash | Sleepers at 0-3 months | Bodysuits |
|---|---|---|
| Every 2 days | 6 to 8 | Roughly the same number |
| Every 3 days | 8 to 11 | Roughly the same number |
| Every 4 days | 10 to 14 | Roughly the same number |
Add one or two if you rarely use a dryer, since a thick sleeper can take a day to air dry. Newborn size can sit a little under the formula, at five to seven, because it is worn for so few weeks and washing a day sooner is cheaper than buying for a size about to end.
What goes in the hospital bag?
Pack one of each size, because this is the point where you know least. The clothing list is short:
- One newborn sleeper and one 0-3M sleeper, both front-opening
- Two bodysuits, one in each size
- A hat, though hospitals usually provide one
- A pair of socks
- A blanket for over the harness
Keep a complete spare outfit in the car rather than in the bag. Wash what you pack before it goes in, which can rinse out finishing residue from new clothes, and leave everything else at home with the tags on.
A going-home outfit does not need to be a separate purchase, and the coming home outfit guide makes the case for a plain sleeper. If you do want something for photographs, take it as an extra and change into the practical sleeper before the car seat. Our coming home outfits are mostly practical zip sleepers.
What can a newborn wear in the car seat?
Thin, close-fitting layers with legs: a bodysuit and a sleeper in most weather, and a single light layer when it is hot. The AAP is direct that bulky clothing, including winter coats and snowsuits, should not be worn under the harness, because it leaves slack in straps that felt tight.
- Legs, not a gown. The crotch strap has to pass between the legs.
- Warmth goes on top. Buckle first, then lay the blanket over the harness straps, leaving the face uncovered.
- Do the pinch test. If you can pinch the harness webbing at the shoulder, tighten it. If it still will not sit snug, the outfit is too bulky.
- Nothing behind the baby. No padded inserts, liners or rolled blankets that did not come with the seat.
- Choose the size that fits on the day. That is usually newborn, or 0-3M for a baby over about 8 lb, because a sleeper that swamps a newborn sits badly under a harness. It is why the bag holds both.
A hat is fine in a car seat because it sits outside the harness, but take it off once the car is warm.
What should a newborn sleep in?
A sleeper, dressed for the room. The AAP says a baby only needs one more layer than you would wear in the same environment, and overheating raises risk. That extra layer can be a bodysuit underneath or a wearable blanket, used in place of loose bedding.
What sits around the clothing matters as much, so here is the short version of AAP and NICHD guidance. Until 1 year old, babies sleep on their backs on a firm, flat surface with only a fitted sheet. No pillows, loose blankets, toys or bumpers. No hat indoors. No weighted sleepers, swaddles or blankets.
Stop swaddling when your baby looks as if they are trying to roll over. Move to a wearable blanket at that point, which is why it is worth having one before the swaddles run out.
To check warmth, feel the chest or the back of the neck rather than the hands and feet, which run cool in newborns. Warm and dry is right. Damp or hot means a layer too many. Do newborns need hats covers why the hat is the first thing to come off.
The US snug-fit rule for sleepwear applies above 9 months. Garments sized 9 months and under can qualify as infant garments instead, so the argument against buying ahead at this age is how quickly they are outgrown. Our baby sleep range is the place to compare styles.
Which garment details matter in the first month?
Openings first, because the baby cannot yet lift their head. Fabric comes after that, and cotton or a knit of rayon made from bamboo will both do the job.
| Detail | Why it helps | Useful until |
|---|---|---|
| Two-way zip or front opening | Nothing over the head, and a diaper change without undressing the whole baby | Zip: the whole sleeper stage. Front-only opening: about 8 to 12 weeks |
| Side-snap or kimono bodysuit | Opens flat, so the baby is laid on the garment | About 8 to 12 weeks |
| Envelope shoulders | A soiled bodysuit comes down over the body, not up past the face | Every size |
| Fold-over mitten cuffs | Covers the hands without separate mittens that can end up in the crib | About 6 to 8 weeks |
| No waistband over the navel | Keeps pressure off the cord stump, which should be gone by 3 weeks | About 3 weeks |
| Printed label, flat seams | Nothing stiff under a baby who lies down most of the day | Every size |
For the cord itself, the AAP's advice that touches clothing is simple: keep the diaper folded below the stump so it stays dry. A one-piece sleeper sits comfortably over it.
Do one check on every gift and purchase before first wear. Pull firmly on any button, bow or trim, and put back anything with ties at the neck. Children’s clothing is excluded from the federal small-parts ban, so this check falls to you. Which closure suits which garment is set out in zipper or snaps.
How does the season of birth change the list?
It changes the mix rather than the count. A long-sleeve bodysuit is the one season-proof piece, since it works alone in a warm room and under everything in a cold one.
| Born in | Buy more of | Buy less of |
|---|---|---|
| Winter | Long-sleeve bodysuits; one outerwear piece, one size up, for the stroller and for carrying | Short sleeves |
| Summer | Short-sleeve bodysuits and thin single-layer sleepers | Knitted layers, anything brushed |
| Spring or fall | Long-sleeve bodysuits, which layer both ways | Season-specific pieces of any kind |
Then look ahead one size. A baby in 0-3M in December will be in 3-6M around February, so that next size should still be winter weight, whatever the stores are putting out.
What can you leave off the list?
Most of what looks like an outfit. The first month is sleep, feeding and diaper changes, and the clothes that get worn are the ones that open easily.
- Shoes. A baby who is not standing has no use for a sole.
- Separate mittens. Loose ones come off and land in the crib. Fold-over cuffs do the same job.
- Pants with a firm waistband, at least until the cord stump has gone.
- Plain pullovers without envelope shoulders. There is no reason to buy one.
- A third hat. Two is enough, and they arrive as gifts.
- Anything decorative on the back. Buttons and bows sit between the spine and the mattress for hours.
- Newborn-size outerwear. It is worn for weeks at most, and it cannot go under the harness.
If someone asks what you need, ask for 3-6M in the season it will be worn. It gets used far longer than anything else on this page.
Which situations change the list?
Four common ones, and each shifts the sizes more than the total. The garments that fit are still the only reliable guide.
- Born early. Buy preemie sizes only once you know they are needed, and follow what the neonatal unit tells you about clothing and hats. Once home, size by actual weight rather than by age.
- Over about 8 lb at birth. Start at 0-3M, keeping one newborn sleeper unopened until you have measured, since birth weights are estimates until the day.
- Twins. Often born smaller, so newborn size tends to last longer and is the one case for buying more of it. Footless styles help when two babies grow at different rates.
- Cloth diapers. Size by weight as usual, and lean on footless sleepers and two-piece sets, which leave room at the seat.
How should you handle the first wash?
Wash only what you will use in the next two weeks, using a fragrance-free detergent and no fabric softener. The AAP advises washing permanent-press clothing before use, and the same first wash can rinse out other finishing residue from new clothes.
- Use the low end of the dose and add an extra rinse if you can.
- Dry on low, because heat is what costs a size.
- Do up zips and snaps before the load goes in, so they do not catch on softer knits.
- Expect a load every day or two. Plan the routine around what you can keep up when tired.
Temperatures by fabric and the stain routine, including what to do about milk and diaper leaks, are in how to wash baby clothes.
Frequently asked questions
How many outfits does a newborn need for the first month? If you wash every other day, five to seven sleepers and five to seven bodysuits in newborn size is enough once you know it fits. Start with two or three of each before the birth.
Should I buy newborn or 0-3 month clothes? Some of both, because you will not know which fits until the baby arrives. A baby over about 8 lb may go straight to 0-3 months.
How many hats does a newborn need? Two, for outdoors in cold weather. Take them off indoors and never leave one on a sleeping baby.
Does a newborn need socks if the sleepers have feet? Not usually. One or two pairs cover footless styles or a thin sleeper on a cold day.
Should I wash all the baby clothes before the birth? No, only what you will use soon. Washed items usually cannot be returned, and you may need to exchange a size.
Can a newborn wear a snowsuit in the car seat? Not under the harness, because bulky layers leave slack in the straps. Dress the baby in thin layers and put a blanket over the buckled harness.
Is a wearable blanket safe for a newborn? Yes, wearable blankets are the alternative to loose bedding. Choose one that suits the room rather than adding extra layers beneath it.
What newborn clothes are a waste of money? Shoes, separate mittens, pullovers without envelope shoulders and any large stack of newborn-size gifts. Ask for 3-6 months instead.
About this article
Written and fact-checked by the PatPat Editorial Team. How we research, source and review what we publish is set out on our editorial standards page.
Method. This list covers clothing and clothing-related items only, and leaves feeding, health and nursery equipment to your pediatrician and other sources. No garments were tested for it. Sleeper, bodysuit, hat, swaddle, sleep bag and sheet counts follow the arithmetic in our quantity and sizing guides, and they are planning figures rather than survey data. The counts for 0-3M before the birth, socks, the blanket and outerwear are our editorial judgment. This is not medical or safe-sleep advice, and your pediatrician’s guidance comes first.
Sources. Newborn weight loss and regain: AAP, Your Baby’s First Month. Back sleeping, sleep surfaces, soft objects, hats indoors, layers, weighted products and swaddling: AAP, A Parent’s Guide to Safe Sleep and NICHD, Safe to Sleep. Car seat clothing and the pinch test: AAP, Winter Car Seat Safety Tips. Cord stump and diaper position: AAP, Umbilical Cord Care. Washing permanent-press clothing: AAP, Formaldehyde Exposure. Infant garment exception: CPSC, Infant Garments and Tight-fitting Sleepwear. Clothing and the small-parts ban: CPSC, Small Parts.
Last updated 5 November 2026 · Next review November 2027
