A guide for parents
Clothes for a premature baby
What the sizes mean, what works around wires, and why the thing that matters isn't size at all.
What's in here
- It's about access, not size
- The sizes, and what they mean
- What to look for
- How much to buy
- Where to find it
- Coming home
If you're reading this from a chair beside an incubator, we're sorry. It's a hard place to be doing anything, let alone shopping.
Two things before anything else. Your baby's nurses are the authority here, not us. Every neonatal unit has its own guidance about what can be worn and when, and it changes as your baby does. Ask them, and ask again next week.
And the clothes may not be needed yet. Very small babies are often nursed with nothing on at all, in a controlled temperature, and that's normal rather than a loss.
It's about access, not size
Everything written about premature baby clothes is about sizing, and sizing is the easy part.
What actually matters is whether somebody can dress your baby without lifting them. There may be a feeding tube, monitor leads, a probe on a foot, a cannula in a hand. Every one of those makes a normal vest impossible, because a normal vest goes over a head and requires arms to be threaded through sleeves.
An ordinary vest
Over the head. Both arms threaded through sleeves. Baby lifted to get it under them.
Three separate disturbances, with wires attached to all of it.
A wrap or kimono vest
Opens completely flat. Laid underneath, folded across, fastened at the side.
No lifting, nothing over the head, and lines stay where they are.
So the things that work are the ones that open flat and fasten at the side. Vests that go on like a cardigan rather than a jumper, and nothing at all over the head.
The detail nobody outside a neonatal unit knows
Footless sleepsuits. Probes are often taped to a foot, and a sleepsuit with feet means undressing your baby completely every time one needs changing or checking.
Footless means a nurse lifts a leg rather than lifts a baby, which is a much smaller disturbance. Same reasoning for poppers running the full length of both legs rather than just around the nappy.
The sizes, and what they mean
Premature sizing goes by weight, not by how many weeks early your baby was. Gestational age gives a rough idea; weight is the answer.
| Size band | Roughly |
|---|---|
| Under 1lb | Very little available commercially. Units usually provide wraps, and much of it is knitted by hospital charities and volunteer groups. |
| 1.5lb to 3lb | Where specialist premature ranges start |
| 3lb to 5lb | The most commonly needed band |
| 4lb to 7lb | Tiny baby, and where high street ranges begin to appear |
| 5lb to 8lb | Overlaps with newborn, though tiny baby often still fits better |
Standard newborn is too big below about 5lb, and it matters more than it sounds. Clothes that are baggy make it harder for a small baby to hold their own temperature, so snug is the aim rather than room to grow.
Ask your nurse for your baby's weight in pounds. Most units work in grams and most clothing is sold in pounds, which is a small unnecessary obstacle at a moment when you don't need one.
What to look for
| Look for | Avoid |
|---|---|
| Wrap-over and kimono fronts | Anything over the head |
| Footless sleepsuits | Closed feet, if probes are in use |
| Poppers down the full leg | Poppers only around the nappy |
| 100% cotton | Synthetic blends and "cotton rich" |
| Printed labels, flat seams | Sewn-in tags, raised stitching, appliqué |
| Plastic poppers, few of them | Metal poppers, and lots of fastenings |
| Soft cotton hats | Tight elasticated cuffs that mark skin |
Premature skin is thinner and more sensitive than a full-term newborn's, so cotton matters here more than anywhere. Organic is the ideal and plain 100% cotton is perfectly good and considerably cheaper. The "cotton rich" warning applies here too, and more so.
Fewer fastenings is better, which is counterintuitive. Every popper is one more thing to negotiate around a wire with one hand.
How much to buy
Less than you'd think, and this is the practical mistake most people make.
Buy for the size they are today, not the size you're hoping for. It's a hard instinct to follow when buying ahead feels like optimism, but a drawer of things they've already outgrown is not the outcome anyone wants.
Two or three vests, two or three sleepsuits, a hat, and scratch mittens. That's genuinely the list until they move up.
Where to find it
Roughly in the order worth trying.
Ask the unit first
Many neonatal units hold donated clothing, and most have knitting or sewing groups attached who make very small garments specifically for this. Below about 1lb this is often the only source, because commercial clothing doesn't go that small.
Specialist premature retailers
Several UK companies do nothing else. They size by weight from around 1.5lb and design around neonatal use, so the wrap fronts and footless sleepsuits are the default rather than something to hunt for.
Neonatal charities
Several exist specifically to support families on neonatal units, and clothing is often part of what they provide. Your unit will know which operate locally.
Other parents
Premature clothes are worn for a few weeks by a baby who then grows, so there are a great many barely-worn tiny garments in lofts belonging to families who have sat exactly where you are.
Coming home
The going-home outfit is a moment, and it's worth having two sizes ready because predicting the day is difficult and babies grow while you wait.
Car seats need particular care with a small baby. Many units check the fit before discharge, and some babies need a car seat challenge first. Nothing padded goes underneath the harness, so warmth comes from a blanket over the top. The same rule as any baby, and it matters more here.
And the tiny things they wore, whether for a week or a day, are worth keeping. Almost everybody does, and nobody has ever regretted it.
A friend spent two weeks on a neonatal unit and said the hardest small thing was sitting there at midnight trying to work out what would fit, on a phone, with no idea what any of the sizes meant. This page is mostly for her.
🌱 While you're here
Premature clothes are worn for a few weeks and then never again. There are a lot of them in lofts, belonging to families who remember exactly what this is like.
Swapaboo is a clothes swap. What they've grown out of pays for their next size, so the clothes themselves cost you nothing. You just pay to have them moved.
Everything's checked and graded before it lists, and it's sized by weight where that's what matters.
We're opening a few families at a time. Pop your email in and we'll let you know when there's a place.
Common questions
What size clothes does a premature baby need?
Premature clothing is sized by weight rather than gestational age. Specialist ranges typically start around 1.5lb and run through 3lb, 5lb, 7lb and 8lb bands. Standard newborn sizing is generally too large below about 5lb. Ask the neonatal unit for your baby's weight in pounds, since units usually work in grams and clothing is sold in pounds.
What clothes work best in a neonatal unit?
Garments that open completely flat, so a baby can be dressed without being lifted or having anything pulled over their head. Wrap-over and kimono-style vests, side-fastening tops, and footless sleepsuits with poppers down the full length of both legs. These allow nurses to reach probes, lines and nappies without a full undress.
Why are footless sleepsuits recommended for premature babies?
Because probes are frequently taped to a foot. A sleepsuit with closed feet means undressing the baby entirely each time a probe needs changing or checking, whereas a footless one allows a nurse to lift a leg instead. It is a much smaller disturbance for the baby.
How many clothes does a premature baby need?
Two or three vests and two or three sleepsuits in the current size, rather than a full wardrobe. Premature babies can gain 150 to 200 grams a week and move through a size band within a fortnight, so buying ahead usually results in clothes that are never worn.
Where can I buy clothes for a premature baby?
Specialist premature retailers are the place to start below 5lb, since several UK companies size by weight from around 1.5lb and design around neonatal use. Neonatal units often hold donated clothing, and knitting and sewing groups attached to many hospitals make very small garments, which is frequently the only source below about 1lb.
Can premature babies wear clothes in an incubator?
It depends entirely on the baby and the unit. Very small babies are often nursed without clothing in a controlled temperature, and specialist incubator vests exist for when clothing becomes appropriate. Every neonatal unit has its own guidance and it changes as a baby develops, so the medical team is the authority rather than any guide.