Seasons0–3 yearsHow to Dress Baby in Summer: Long, Light and in the Shade
Long, light, in the shade: what your baby wears in summer, when the sun hat fits and why no blanket on the stroller.
Figuring out how to dress baby in summer sounds easy: as little as possible, done. But sun and heat pull in opposite directions. In the sun, one thin, long, loose layer protects your baby better than bare skin; indoors and out of the sun, things can be airier. Here's what your baby wears on summer days outdoors, at home and at night, and what changes with the first birthday.
At a glance
First year
shade, not sun
Feels below 68°
thin beanie, never sun hat
Feels 68° and up
in the sun: sun hat
Stroller
sunshade, not a blanket
How to dress baby in summer: long or short sleeves?
Outdoors in the sun, the answer for the whole first year is long, light and loose. A baby under 12 months doesn't belong in direct sun at any UV level. Shade comes first, then one thin, long layer: a long-sleeve onesie and light pants in pale cotton, plus thin socks.
| Feels like outside | Note | What your baby wears |
|---|---|---|
| 59–67 °F | two layers | Long-sleeve onesie, footie or pants, light jacket, thin beanie, thin socks, soft cloth shoes |
| 68–76 °F, sunny | one layer | Long-sleeve onesie, light pants, thin socks, sun hat |
| 77 °F and up, sunny | airy | Long-sleeve onesie, light pants, thin socks, sun hat |
| 77 °F and up, no sun | airy | Short-sleeve onesie, thin socks |
How to dress baby outdoors in summer, first year: a footie up to 5 months, pants after that. Sunny means a UV index of 1 or higher, even under clouds.
On an 80 degree day, your first instinct might be to strip your baby down. In the first year, though, a short-sleeve onesie only works outdoors when there's no sun, say late in the evening. Even in the shade, the long, thin clothes stay on, because shade alone doesn't fully protect. A quick test: hold the fabric up against your hand. If you can see your skin through it, it doesn't protect enough.
From 86 °F air temperature or a feels-like 90 °F, it's all about protecting your baby from the heat, and that's where how to dress baby in hot weather comes in.
Baby sun hat or thin beanie: what does your baby need in summer?
On a sunny morning that feels like 63 °F, lots of parents reach for the sun hat. But below a feels-like 68 °F (20 °C), your baby needs warmth on their head: they get the thin beanie, even in sunshine. Sun protection then comes from the canopy, shade and covering clothes.
From a feels-like 68 °F in real sun, the sun hat with a brim or neck flap goes on, even when it's cloudy: up to 80% of UV rays get through. The thin beanie comes off then, because your baby gives off a lot of heat through their head. Without sun, your baby needs nothing on their head from 68 °F in the first year.
Feels like means with the wind factored in, not just the number in the forecast. The hat rule for every temperature is in how to dress baby for the weather. In BabyWear, the baby weather app, you see the outfit for morning, midday and evening with the feels-like temperature and the UV index.
Below a feels-like 68 degrees, the thin beanie; from 68 degrees in the sun, the sun hat. Never both.
Summer baby: how to dress a newborn in summer
With a newborn in the middle of summer, the same rules apply as above. The rule of thumb “one more layer than you” is a cold-weather rule: it only applies below 59 °F, for a baby who's lying or sitting still. In warm weather, your baby wears no more than you do.
The neck tells you whether it's right: warm and dry means just right. Cool hands and feet are normal; when it's humid, take a layer off sooner rather than later. Red cheeks, a sweaty neck, fussiness or listlessness can mean overheating: take off a layer, move somewhere cool, offer something to drink. If the skin is hot and dry or your baby seems dazed, call 911 right away.
Under 6 months, your baby gets no water, not even in the heat. Nurse more often or offer an extra bottle of correctly prepared formula, never watered down. From about 6 months, small sips of water between meals are fine.
BabyWear – Weather & Outfits
Dress your baby right: outfits for outdoors, indoors, and sleep, based on the weather.
Try free for 3 days
Covering the stroller with a blanket? Let the air in instead
A muslin blanket over the stroller looks like shade, but heat builds up underneath. Measured on hot days, a dry muslin made the air inside the stroller about 5 °F (2.6 °C) warmer, a flannel blanket about 7 °F (3.7 °C). Overheating raises the risk of sudden infant death syndrome (SIDS).
- Instead of a blanket: the canopy, a stroller umbrella or a sunshade. Park in the shade, check often, and no stroller naps in the heat.
- Rain cover: only while it's raining, with the vents open; never closed in the sun or from 77 °F air temperature.
- Carrier: it warms your baby's torso, so one layer less. Keep the face uncovered, and only carry for short stretches in the heat.
- Thunderstorms: get inside right away, the stroller doesn't protect. Wait 30 minutes after the last thunder before heading back out.
Never alone in the car
Never leave your child alone in the car, not even for a minute. Even at 72 °F outside, a car can reach about 117 °F within an hour.
Sunscreen for babies under 6 months: when, and what changes at 1?
Can babies wear sunscreen? It only becomes part of the routine from the first birthday. Before that, shade and clothing come first: no routine sunscreen under 6 months, and ideally none at all until 12 months. The UK and the US draw this line at 6 months, Germany at the first birthday. This article follows the stricter rule, including for your fall baby who's nine months old by summer.
From 12 months, use sunscreen with SPF 30 or higher, ideally 50+, only on skin that clothing doesn't cover. It never replaces shade and clothing. Any sunburn in the first year is a reason to get medical advice right away, and baby oil is not sun protection.
How to dress a toddler in summer: when they run wild and won't wear a hat
From the first birthday, sun protection counts from UV index 3. From 18 months, at a feels-like 77 °F and up, your child wears a UPF shirt, light pants, shoes and, from UV index 3, a cap with a neck flap. If the UV index is below 3, say late in the evening, a T-shirt, shorts and sandals are fine, except by the water, in the sand or for long stretches outdoors.
If your child pulls off every cap, shade matters all the more, plus long, thin clothes and sunscreen on the face, ears and neck too. From UV index 8, skip the midday sun from 10 a.m. to 4 p.m. By the water, stay within arm's reach, and remember that water doesn't protect from the sun. Kids don't drink enough on their own: plan drink breaks and change sweaty clothes.
Summer evenings, indoors and at night: what should baby wear?
Evenings often cool down fast: at a feels-like 59–67 °F, it's back to two layers with a light jacket and a thin beanie instead of the sun hat, even in sunshine. Below 59 °F, it's three.
When you head inside, onto the bus or into Grandma's, the sun hat and jacket come off right away, even if your baby is asleep. Indoors, from 3 months your baby wears no more layers than you do. Under 18 months, a diaper and a short-sleeve onesie are enough from 75 °F, and from 79 °F a sleeveless onesie, no socks. More in ideal room temperature for baby and what to wear.
BabyWear – Weather & Outfits
Dress your baby right: outfits for outdoors, indoors, and sleep, based on the weather.
Try free for 3 days
Even in summer, pick the sleep sack by the room, never by the calendar: from 75 °F, the summer sleep sack with 0.5 TOG, from 64 to 74 °F the mid-season sleep sack with 1.0 TOG (TOG is a sleep sack's warmth rating). From 81 °F your baby wears just a diaper inside it; if the neck is still hot, the sleep sack can come off, but never use a blanket instead. No hat, no socks, and the fan out of reach and never pointed at your baby. BabyWear estimates the bedroom, and on warm nights it's often warmer: measure next to the crib and enter the value. The TOG chart is in what sleep sack for what temperature?
Frequently asked questions
In the first year, outdoors in the sun: one thin, long layer, meaning a long-sleeve onesie, light pants and thin socks, plus shade and, from a feels-like 68 °F, a sun hat. Without sun, a short-sleeve onesie is enough from 77 °F. In the evening at a feels-like 59–67 °F, your baby wears a footie or pants, a light jacket and a thin beanie.
This article offers guidance, not medical advice. If your baby seems sick, has a fever or a sunburn, ask your pediatrician or midwife. Sources: BIÖG (2024 and 2025), German Federal Office for Radiation Protection (2026), German Weather Service (2026), The Lullaby Trust (2019), American Academy of Pediatrics (2026), NHS (2024), Ergonomics (2023).
