Protecting an infant’s delicate skin from the sun while keeping them comfortable in the water is a two-part challenge that every new parent faces. The wrong swimsuit leaves gaps where UV rays sneak through, chafes tender skin, or makes diaper changes a wrestling match — none of which makes for a relaxing day at the beach or pool.
I’m Mohammad — the founder and writer behind ProteinJug. I’ve spent years analyzing baby apparel construction, fabric certifications, and real-user feedback to find what actually delivers on sun protection and durability for the smallest family members.
After researching dozens of options and sifting through thousands of verified reviews, I’ve narrowed the field to the five best options that solve these exact problems. This guide covers the best swimsuits for infants and explains what separates a genuinely protective suit from one that just looks cute.
How To Choose The Best Swimsuits For Infants
Baby swimwear is not miniature adult swimwear. Infants have different proportions, different skin sensitivity, and zero tolerance for awkward zippers or scratchy tags. Three factors separate the suits that earn repeat use from those that get abandoned after one outing.
UPF Rating vs. Fabric Density
A UPF 50+ label means the fabric blocks 97.5 percent of UVA and UVB rays, but that rating depends on the material staying intact. Stretchy knits can lose UPF when stretched tight over a baby’s belly, while denser woven fabrics maintain their protection. Check that the suit has a physical barrier feel, not just a tag.
Zipper Placement and Diaper Access
Full-body suits typically use a front zipper or a back zipper. Back zippers let babies lie on their stomach without a metal ridge digging in but require flipping the baby over to change. Front zippers with a snap crotch give faster diaper access. The right choice depends on whether you are doing quick changes on a pool deck or long beach days.
Drying Speed and Chlorine Resistance
Infant suits made from a polyester-spandex blend dry noticeably faster than cotton or nylon-heavy fabrics. Chlorine and saltwater degrade elastic fibers over time, so suits with a higher polyester percentage maintain their shape and UPF rating through more washes. Skip suits that feel “bathrobe soft” — they absorb water and stay wet.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| UNIFACO Baby Boy Swimsuit | Premium | Full coverage + hat included | UPF 50+, front zip, leg coverage | Amazon |
| Hurley Baby 2-Pack | Premium | Two suits, budget-friendly value | 2-pack, full zip, snap crotch | Amazon |
| Columbia Baby Sandy Shores II | Mid-Range | Older infants, loose fit, easy diaper changes | Full front zip, one-piece | Amazon |
| Infant Baby Girl Swimsuit One-Piece | Mid-Range | Floral/leopard design, hat included | Back zip, snap bottom, hat set | Amazon |
| Simple Joys by Carter’s Set | Budget | Two-piece trunk + rashguard | Long sleeves, quick-dry, hat included | Amazon |
In‑Depth Reviews
1. UNIFACO Baby Boy Swimsuit UPF 50+ Sun Protection One Piece Zip Bathing Suit with Sun Hat
The UNIFACO suit packs the most complete sun protection package in this lineup. The fabric carries a UPF 50+ rating and covers the full torso, arms, and legs, leaving almost no skin exposed. The zip-down front design makes dressing a wiggly infant straightforward, and the matching sun hat’s adjustable chin strap keeps it from floating away on a breezy beach day.
Parents consistently report that the neon-bright colors improve visibility in pool or surf conditions — a practical safety bonus that goes beyond aesthetics. The fabric dries quickly and the stretch in the polyester-spandex blend allows for a comfortable range of motion during crawling or splashing.
One thing to consider is that the hat runs slightly large on some infants under six months, so expect a looser fit until the baby grows into it. The thick material also means you need a moment to ensure the legs are fully extended before zipping up, but the trade-off in coverage is worth the extra second.
Why it’s great
- Full leg and arm coverage eliminates the need for sunscreen on covered areas
- Sturdy front zipper holds up well even when wet
- Vibrant, high-visibility color makes the baby easy to spot in water
Good to know
- Hat may be loose on younger infants
- Thicker material requires careful leg alignment before zipping
2. Hurley Baby 2-Pack Long Sleeve Rash Guard Coverall
Hurley delivers a two-pack of long-sleeve coveralls that balances coverage with affordability. The fabric feels soft against baby skin and the full front zipper with snaps at the crotch creates a generous opening for diaper changes without needing to pull the suit completely off. The design leaves the legs free, which helps with heat regulation on warmer days.
Many parents report using these suits on infants as young as two months, noting that the neckline allows easy breathing and the elastic-free leg cuffs prevent red marks. The two-pack includes different colorways, giving you a backup when one suit is still drying from a morning pool session.
The primary caution from real-world use is that the UPF protection is fabric-based rather than an applied coating, and a small number of users experienced sunburn on the arms after extended direct exposure in bright, 75-degree conditions. Layering a zinc-based sunscreen on exposed areas before extended outings is recommended.
Why it’s great
- Two suits for the price of most single suits
- Soft, gentle fabric that does not irritate newborn skin
- Snap crotch makes diaper changes fast
Good to know
- Arms may require sunscreen underneath for very long direct sun exposure
- Zipper can pinch delicate skin if not careful during closure
3. Columbia Baby Sandy Shores II Sunsuit
Columbia’s one-piece sunsuit covers the entire body in a single zip-up design that is especially practical for infants who cannot yet sit still. The fabric is not too thin and not too thick — a balanced weight that provides sun protection without trapping heat. The loose fit accommodates growth, with many parents noting the 12-18 month size still fitting a 30-inch, 25-pound baby comfortably.
The full front zipper makes getting the suit on and off simple, and the material does not stain easily. The bright pattern also makes the baby easier to spot from a distance. It is particularly well-suited for cooler days or short outings where full coverage is the priority.
The main drawback noted across multiple reviews is zipper durability. Several owners reported the zipper breaking after only a few wears, which can be a dealbreaker if you plan to use the suit regularly. A Columbia warranty claim may be necessary, so keep the purchase receipt handy.
Why it’s great
- Roomy cut accommodates baby growth spurts
- Fabric resists staining from sunscreen and sand
- Easy to spot design simplifies poolside monitoring
Good to know
- Zipper failure has been reported after 2-3 uses
- Material can become fuzzy from rough pool surfaces
4. Infant Baby Girl Swimsuit One-Piece Long Sleeve Rash Guard with Hat Set
This floral and leopard print suit brings a strong fashion element without sacrificing function. The back-zip design with a snap bottom creates a two-step diaper access route — convenient for quick changes while keeping the main closure out of the way when the baby is lying on her back. The included soft neoprene hat with chin ties adds coverage without being floppy or uncomfortable.
The fabric is thick enough to provide real sun protection without being heavy, and the material holds up well after washing with minimal shrinkage. Many parents mention that their baby wore this suit for months beyond the intended size range, suggesting the cut has generous room for growth.
A minor hassle emerges when the suit is wet: the snug sleeves can be tough to pull off. The hat also ran a little tight on some infants out of the package, though a gentle stretch resolved that issue. The back zipper can also be slightly more fiddly than a front-zip for parents who prefer one-handed dressing.
Why it’s great
- Thick, durable fabric holds shape well after repeated washes
- Hat stays secure with comfortable chin ties
- Generous cut extends the wearable window for growing babies
Good to know
- Wet sleeves can be difficult to remove from baby arms
- Back zipper is less convenient for on-the-go diaper changes
5. Simple Joys by Carter’s Baby Boys’ Swimsuit Trunk and Rashguard Set
The Simple Joys set offers a two-piece alternative for parents who prefer separating the top and bottom. The long-sleeve rashguard covers the upper body while the elastic-waist trunk handles the lower half. The included matching sunhat with a brim provides face and neck coverage that the two-piece cut does not.
The lightweight, quick-drying fabric kept its bright colors after multiple washes, and the elastic waistband makes the trunks easy to pull on even over a wet diaper. The frog design is playful without being loud, and the set fits true to size according to the majority of reviewers.
Because this is a two-piece suit, there is a gap between the rashguard and trunks where the belly and lower back are exposed. This design leaves more skin sunscreen-dependent than a one-piece would. The shorts also dry faster than the shirt, which can feel uneven when changing back into dry clothes.
Why it’s great
- Two-piece design makes diaper-only changes possible without undressing the top
- Lightweight fabric dries faster than many one-piece suits
- Cute pattern held up well with no fading after multiple washes
Good to know
- Exposed belly requires separate sunscreen application
- Shorts and shirt dry at different rates
FAQ
Can I put a swimsuit on a newborn who hasn’t had their first bath yet?
Is a two-piece or one-piece swimsuit better for a baby who wears diapers?
Final Thoughts: The Verdict
For most users, the best swimsuits for infants winner is the UNIFACO Baby Boy Swimsuit because it provides the most complete coverage with a front zip, UPF 50+ rating, and an included sun hat — all in one package. If you want the flexibility of a two-pack at a great value, grab the Hurley Baby 2-Pack. And for a budget-friendly two-piece option that dries fast and washes well, nothing beats the Simple Joys by Carter’s Set.