The best baby summer clothes are light, breathable cotton or linen: short-sleeve bodysuits for indoors, plus loose long-sleeve rompers or light pants and a wide-brimmed hat for time outside. For sun and heat safety, see the NHS advice quoted below.
- Breathable beats cute: thin cotton or linen, loose cuts, and long sleeves and legs for time outdoors.
- A wide-brimmed hat shades more of the face and neck than a cap.
- For sun and heat safety, read the NHS advice quoted below.
- Fabric matters more than the label: weave, color, and fiber all change how much sun a piece blocks, and no summer garment covers face, hands, or feet.
Before the heat, there is the swing season: how to dress a baby in spring.
What should a baby wear in hot weather?
Light, breathable pieces that still cover the arms and legs when you are outside. Summer dressing is less "as little as possible" and more "as light as possible while still covered": a loose, long-sleeve muslin romper covers more skin outdoors than a bare-armed onesie, and a short-sleeve cotton bodysuit is the indoor workhorse. Start with a handful of these pieces and build seasonally instead of over-buying.
This article is general information, not medical or safety advice. For guidance on your baby, sun exposure, heat, or any health question, follow your pediatrician and the named authorities linked here. See our medical disclaimer.
Which fabrics keep a baby coolest?
Lightweight, breathable natural fibers — cotton and linen lead the pack. Here is the honest wrinkle we call the fabric-vs-sun tradeoff: the fibers that breathe best are not always the ones that block the most UV, so summer dressing is a balance, not a single winner.
| Fabric | Breathability | Summer strengths | Watch-outs |
|---|---|---|---|
| Pure cotton | Excellent | Soft, washes hot, cool against skin | Loose or light-colored weaves block less UV than tightly woven pieces |
| Linen | Excellent | Very airy, dries fast, feels dry in humidity | Creases; can feel coarse until washed a few times |
| Cotton/synthetic blend | Good | Holds its shape | Traps heat if too much synthetic; check the feel |
| Labeled UPF pieces | Varies | Rated coverage for beach or pool days | Rating can degrade with washing and wear; still leaves face and hands uncovered |
UV protection varies by garment, weave and color, and it can fade with wear and washing. See our baby fabrics compared guide for the full breakdown.
What does the NHS say about sun and heat for babies?
We do not write our own sun or heat-safety rules. These are short extracts from the NHS website, quoted word for word:
- Sun: "Children aged under 6 months should be kept out of direct strong sunlight." (Information from the NHS website, as at 161026)
- Clothing, for everyone: "Wear clothes and sunglasses that provide sun protection, such as:" (Information from the NHS website, as at 161026)
- "a wide-brimmed hat that shades the face, neck and ears"
- "a long-sleeved top"
- "trousers or long skirts in close-weave fabrics that do not allow sunlight through"
- "sunglasses with wraparound lenses or wide arms with the CE Mark and British Standard Mark 12312-1:2013 E"
- Heat: "A heatwave can affect anyone, but some people are more vulnerable, including: … babies and young children aged 5 years and under" (Information from the NHS website, as at 161026)
- Feeling unwell: "If you or someone else feels unwell with a high temperature during hot weather, it may be heat exhaustion or heatstroke." (Information from the NHS website, as at 161026)
Information from the NHS website is licensed under the Open Government Licence v3.0. Quoting the NHS does not imply NHS endorsement of Babbez or its products. For your own baby, heat, sleep in hot weather, or sunscreen, ask your pediatrician or doctor.
What about strollers and hats?
For stroller or pram walks, pack a canopy or parasol and a brimmed hat. For how to dress a baby for sleep in hot weather, ask your pediatrician.
| Situation | What to pack | Where to check |
|---|---|---|
| Sunny stroller walk | Canopy or parasol; brimmed hat | NHS sun advice (quoted above) |
| Outdoor time, hot day | Light, covering layers; a plan for shade | NHS heatwave advice (quoted above) |
| Hoods or jackets with cords | Check for cords and drawstrings | CPSC drawstring guidelines |
For hoods or outerwear with cords or drawstrings, see the CPSC drawstring guidelines.
What should I actually buy for a summer baby wardrobe?
Buy smart — enough of the right few pieces, not a closet you will outgrow. Newborn is the shortest-lived size and some babies skip it, so concentrate your summer spend at 0-3 and 3-6 months, and size a season ahead if your baby will hit the heat older. Fit varies notably by brand, so size by weight and length, not the calendar.
| Piece | Suggested count | Why it earns its spot |
|---|---|---|
| Short-sleeve cotton bodysuits | 6-8 | The blowout-and-spit-up workhorse; wash and dry fast |
| Loose long-sleeve muslin rompers | 2-3 | Cover arms in the sun while still breathing |
| Lightweight footless pants / shorts | 3-4 | Layer for AC indoors, strip off outside |
| Wide-brim sun hats | 2 | One always in the wash; brim shades the neck |
| Zip sleep pieces (light, seasonal) | 3-4 | The 3am change is faster with a zipper |
A note on the joy part: there is real pleasure in dressing your baby in the linen romper you picked out, and the "so many compliments" is half the fun. Just weight the buy toward pieces that breathe and wash well — that is where the cost-per-wear lands. For counts by age see how many baby clothes do you need, and to keep it cheap, our how to save money on baby clothes guide.
- Light, breathable pieces that still cover arms and legs outdoors.
- Brimmed hat that shades the neck.
- Read the NHS sun and heat advice above before hot-day outings.
- A canopy or parasol for stroller shade.
- Buy most of the summer wardrobe at 0-3 and 3-6 months, sized by weight and length.
- Wash new pieces before first wear.
What should a baby wear for pool, beach, and splash-pad days?
For water play, many parents choose a UPF-rated rash guard or swim shirt with a swim diaper and a wide-brim hat, which cover more skin than a swimsuit alone and dry faster than everyday cotton. Pack a dry cotton layer to change into afterward so baby is not left sitting in wet fabric. For sun exposure itself, see the NHS advice quoted above, and ask your pediatrician about sunscreen for the parts clothing does not cover.
Frequently asked questions
What are the best baby clothes for the summer?
Short-sleeve cotton bodysuits, a couple of loose long-sleeve muslin rompers for time outside, light footless pants or shorts, two wide-brim sun hats, and a few light zip pieces. See the wardrobe table above for suggested counts.
What should a 6-month-old wear in summer?
The same light, breathable pieces, in the size that fits your baby by weight and length; brands differ, so check each brand's chart rather than the age on the tag. Our baby clothes sizes by age guide walks through it.
Is cotton or linen better for a hot day?
Both breathe well. Linen is airier and dries fast; cotton is soft and washes hot. For sun coverage, tightly woven fabrics block more UV than loose knits, so weave and color matter alongside fiber. See our fabrics compared guide.
Do babies need sunscreen or is clothing enough?
Clothing and shade cover most of the body, but face, hands, ears, and feet stay exposed even in the best outfit. Sunscreen for a baby is a question for your pediatrician; the NHS sun advice is quoted above.
What does UPF mean on a summer garment?
UPF stands for ultraviolet protection factor: a rating on the label for how much of the sun's UV a fabric blocks. Protection can drop with washing and wear, and no garment covers every part of the body.
Sources: NHS: Sunscreen and sun safety (page last reviewed 24 March 2026) and Heatwave: how to cope in hot weather (page last reviewed 12 June 2026), quoted word for word as at 16 October 2026; Information from the NHS website is licensed under the Open Government Licence v3.0. U.S. Consumer Product Safety Commission — children's outerwear drawstring guidelines; OEKO-TEX and GOTS — textile certifications (harmful-substance limits and organic content, not health outcomes). Certifications indicate tested substance limits or fiber content only, not hypoallergenic or health claims.
Continue your Babbez journey
This guide is part of the Baby (3-12 Months) stage.
- Next stage: Toddler (1-3 Years)
- Related here: What Baby Clothes to Send to Daycare (Easy, Labeled, Practical), How to Dress Your Baby for Fall: Layering Cheat Sheet
- See all stages in the Babbez Baby Journey