Newborns should wear one more layer of clothing than you’re comfortable in, made from soft, breathable fabrics like cotton or muslin. That simple rule covers most situations, whether your baby is sleeping, hanging out at home, or heading outside. The details below will help you choose the right pieces, fabrics, and layering strategy for every temperature and scenario.
The One-Layer Rule
If you’re comfortable in a T-shirt, your baby needs a T-shirt plus a light layer on top. If you’re wearing a sweater, your baby needs a sweater-weight layer plus one more. This guideline works because newborns can’t regulate their own body temperature the way adults can. They lose heat quickly through their heads and extremities, but they also overheat easily since they can’t kick off a blanket or tell you they’re too warm.
To check whether your baby is at a comfortable temperature, place your hand on their chest or the back of their neck. These areas reflect core body temperature better than hands or feet, which tend to feel cool even when a baby is perfectly warm. Skin that feels hot or sweaty means you should remove a layer.
What to Dress Your Baby in for Sleep
Safe sleep clothing is the area where the guidelines are most specific. The AAP recommends keeping all loose bedding, blankets, quilts, and pillows out of your baby’s sleep area. Instead, use a wearable blanket (also called a sleep sack) or dress your baby in layers of fitted clothing. Weighted blankets, weighted swaddles, and weighted sleepers should not be used.
Hats should not be worn indoors while sleeping. The AAP advises against indoor hats except during the first hours after birth or in a NICU setting, because they trap heat and can slip over a baby’s face.
A typical sleep outfit in a room kept between 68°F and 72°F is a short-sleeve bodysuit underneath a 1.0 TOG sleep sack. TOG is a rating that measures how warm a fabric layer is. Here’s a quick reference:
- 0.2 TOG: Best for warm rooms, 75°F to 81°F
- 1.0 TOG: Best for moderate rooms, 68°F to 75°F
- 2.5 TOG: Best for cooler rooms, 61°F to 68°F
- 3.5 TOG: Best for cold rooms below 61°F
If you don’t have a sleep sack with a TOG rating, a footed sleeper over a bodysuit works well in most homes. On warm nights, a single bodysuit or even just a diaper with a lightweight sleep sack is enough.
Signs Your Baby Is Overheating
Overheating is a risk factor for SIDS, so it’s worth knowing the warning signs. A baby who is too warm may feel hot to the touch, look flushed or red, have damp hair, or act unusually fussy or restless. In more serious cases, you might notice rapid breathing, sluggishness, or clammy skin. Some babies overheat without visible sweating, so touch-checking the chest or neck is more reliable than looking for sweat alone.
Best Fabrics for Newborn Skin
Cotton is the go-to fabric for newborns. It’s breathable, soft against sensitive skin, and holds up through constant washing. Cotton muslin is especially popular because it’s lightweight and helps regulate temperature, making it useful in both warm and cool conditions. Organic cotton offers the same comfort with fewer chemical residues from the growing process.
Jersey knit, which is a stretchy cotton weave, works well for bodysuits and sleepers because it moves with your baby. Bamboo-blend fabrics are another good option: they’re naturally soft, moisture-wicking, and hypoallergenic, which helps if your baby tends to get sweaty or has reactive skin.
Polyester and synthetic fabrics are less breathable and can irritate sensitive skin even in babies without diagnosed allergies. If your home runs warm, avoid heavier synthetics like fleece. In cold climates, fleece has a place as an outer layer, but it shouldn’t sit directly against your baby’s skin for extended periods.
Clothing Essentials for the First Weeks
Before the umbilical cord stump falls off (usually within the first two weeks), side-snap or kimono-style shirts are the easiest option because they avoid rubbing against the healing area. After that, here’s a practical starter wardrobe:
- Bodysuits: 4 to 6, with snap closures at the crotch for easy diaper changes
- Footed sleepers: 4 to 6, ideally with two-way zippers that open from the bottom
- Sleep gowns: 2, open at the bottom for quick middle-of-the-night diaper changes
- Long pants: 2 to 4 pairs
- Socks or booties: 4 to 6 pairs
- Knit hats: 1 to 2, for outdoor use only
Newborns go through multiple outfit changes a day thanks to spit-up and diaper blowouts, so having at least four of each basic item means you’re not doing laundry every single day.
Design Features That Make Life Easier
Not all baby clothes are equally practical at 3 a.m. A two-way zipper that opens from the foot end lets you access the diaper without unzipping the entire outfit and exposing your baby’s chest to cold air. Magnetic closures are a newer option that snap into place silently and almost instantly, which is a real advantage during nighttime changes when you’re trying to keep the lights dim and your baby drowsy.
Envelope necklines (the overlapping shoulder flaps on many bodysuits) let you pull a soiled shirt down over the body instead of over the head. Fold-over cuffs on sleeves double as built-in mittens to keep tiny fingernails from scratching your baby’s face, and they eliminate the problem of separate mittens that constantly fall off. Kimono or wrap-style tops that open flat are especially helpful in the first few weeks, when your newborn has minimal head control and threading arms through sleeves feels precarious.
Getting the Right Size
Newborn-size clothing generally fits babies weighing 5 to 8 pounds, while 0-to-3-month sizes fit 8 to 12 pounds. These ranges vary by brand. Carter’s newborn size runs 6 to 9 pounds, while Old Navy’s newborn tops out around 7 pounds. Many babies outgrow newborn sizes within the first few weeks, and babies born above 7 or 8 pounds may skip the newborn size entirely.
A good strategy is to have a small number of newborn-size items and stock up more heavily on 0-to-3-month pieces. Clothes that are slightly too big are fine for lounging at home, but sleepwear should fit snugly. Excess fabric around the face or neck is a suffocation risk.
Dressing for Hot and Cold Weather
When temperatures climb above 75°F, less is more. A diaper and a sleeveless cotton onesie may be all your baby needs. If you’re moving between outdoor heat and air-conditioned spaces, bring one light layer to add indoors. Sun protection matters more than extra clothing: keep your newborn in the shade, and use a stroller canopy or light blanket draped over the stroller (not directly on your baby) rather than relying on heavy cover-ups.
In cold weather, layering is more effective than one thick piece. Start with a bodysuit, add a long-sleeve layer, then a jacket or bunting. Cover your baby’s head with a hat and hands with mittens, since those are the areas where heat escapes fastest. Remove all extra layers as soon as you’re back indoors to prevent overheating.
One important cold-weather safety note: bulky coats interfere with car seat harness fit. The straps can’t compress a puffy coat tightly enough to hold your baby securely in a crash. Instead, buckle your baby in wearing thinner layers and place a blanket over the harness once it’s snug.