Key Takeaways
- Deepest markdown: The RuffleButts Novelty Rash Guard Swimsuit lists UPF 50+ in its title, ranks #1 in its category and is close to half off.
- Trusted brand for young babies: The Gerber Girls Long Sleeve Rashguard ranks #5 and covers arms and torso in one piece, but its markdown is small.
- Coverage for a suit you already own: The Children’s Place Hooded Swim Coverup has the biggest discount of any trusted brand this week. The deal size is 5 Years, though.
- Trunks need a top: The RUGGEDBUTTS Hybrid Swim Trunks are the only trunks here with a UPF 50+ rating in the listing.
September is when swimsuits quietly go to clearance, and it’s also when a lot of families sign up for indoor swim lessons again. If your baby has the kind of fair skin that turns pink after one stroller walk at noon, this is a good week to buy next summer’s long sleeve UPF 50 swimsuit. It also covers the warm-weather trip over winter break that you’ve probably already started planning.
While I went through the baby swim listings for this Berry Basket, RuffleButts kept showing up. Its UPF 50+ rash guard one-pieces are close to half off in several prints, and the Novelty print is ranked #1 in its category. Gerber’s long sleeve rashguards came in with much smaller markdowns, but they’re from a brand parents already trust, and they are the only suits here where the listing confirms long sleeves.
I ranked the picks by how much skin they cover. Long sleeve rash guards come first, then short sleeve suits and cover-ups, then trunks, then the swim diapers that go underneath. If your baby’s skin reacts to more than the sun, our roundup of organic cotton clothes for babies with eczema-prone skin is a good next read. Prices verified September 19, 2026.
Which long sleeve baby swimsuits cover the most skin?
A one-piece rash guard covers the most skin, because the torso and arms are in one garment and nothing rides up. Gerber and RuffleButts are the two brands to look at this week, and they trade off in different ways.
Gerber Girls Long Sleeve Rashguard
If you have a very young baby with fair skin, this Gerber long sleeve one-piece rashguard is where I’d start. It ranks #5 in its category, and the Yellow Daisies print on the card comes in size 0-3 months. The listing title doesn’t give a UPF number, so check the rating on the card first, and remember that the American Academy of Pediatrics advises keeping babies under 6 months out of direct sun.
- Long sleeve one-piece rashguard
- Yellow Daisies print
- Size 0-3 months
Gerber Boys Long Sleeve Rashguard
The boys’ version has “Sun Protection” in its name and ranks #14. Honestly, the markdown barely counts as a sale, so what you’re getting here is a trusted brand at a normal price. The deal size is 3-6 months, which makes it a good fit for a baby’s first beach trip this winter.
- Long sleeve sun protection rashguard
- One-piece design
- Size 3-6 months
RuffleButts Novelty Rash Guard Swimsuit

RuffleButts Baby Girls Novelty Baby One Piece – Rash Guard Swimsuit UPF 50+
This is the one getting the most attention right now. The RuffleButts Novelty rash guard one-piece ranks #1, lists UPF 50+ in its title and has the deepest markdown in this post. The title doesn’t say how long the sleeves are, though, so if you need full arm coverage, check the photos on the card before you buy.
- UPF 50+ rated
- Rash guard one-piece
- Novelty print
RuffleButts Gingham Polka Rash Guard

RuffleButts Baby Girls Gingham Polka One Piece – Rash Guard Swimsuit UPF50+
It’s the same UPF 50+ rash guard one-piece in a gingham and polka dot print, for parents who find the novelty prints a bit busy. Several colors of this print are on sale at the same markdown. To me, that looks like clearance across the whole brand and not one leftover size.
- UPF 50+ rated
- Rash guard one-piece
- Gingham and polka dot print
Are short sleeve baby swimsuits enough for fair skin?
On their own, short sleeve swimsuits leave the forearms bare, so fair-skinned babies need shade, sunscreen or a cover-up as well. These two work well as a pair.
Gerber Short Sleeve Swimsuit
With short sleeves, the shoulders are covered and the forearms are exposed. That’s a real trade-off for pale skin, but this Gerber Seashells one-piece ranks #17 in its category. The deal size is 12 months, so it’s a smart buy for next summer if your baby is younger than that now.
- Short sleeve one-piece
- Seashells print
- Size 12 months
The Children's Place Hooded Swim Coverup

The Children's Place,Baby Girls,and Toddler Hooded Swim Coverup,Happy Pink Long Sleeve,5 Years
A long sleeve hooded coverup is the easiest way to add coverage to a suit you already own. The hood covers the scalp and the back of the neck, which sunscreen often misses. It has the deepest discount of any trusted brand this week.
The size on the card is 5 Years, so it’s meant for an older sibling unless the size menu shows smaller options. For babies, a good hat does the same job as the hood, and we’ve rounded up sun hats that stay on a baby’s head.
- Long sleeve hooded coverup
- Happy Pink color
- Size 5 Years
Swim trunks for fair-skinned baby boys
Trunks cover the legs and nothing else, so each pair below needs a rash guard top if your baby burns easily. Only one of them lists a UPF rating.
RUGGEDBUTTS Hybrid Swim Trunks

RUGGEDBUTTS Boys Performance Hybrid Swim Trunks – Boys Swim Trunks UPF 50+
RUGGEDBUTTS is the boys’ line from RuffleButts, and these hybrid trunks list UPF 50+ in the title. “Hybrid” usually means the trunks are made to double as play shorts, which saves you packing a second pair. They were added to our tracker two hours before this post went up and currently rank #30.
- UPF 50+ rated
- Performance hybrid trunks
- Boys' sizing
Gerber Boys Swim Trunks
Disney Mickey Mouse Swim Trunks
This is the cheapest suit in this roundup, and a fun one for a Mickey fan. It’s size 18 months in the Food Blue print, and the listing gives no UPF rating. If you’re also shopping for dry land, we’ve got toddler boys’ shorts with pockets too.
- Mickey Mouse design
- Food Blue print
- Size 18 months
Which swim diapers go under a rash guard swimsuit?
Any disposable swim diaper works under a one-piece rash guard, so choose by size and by how often you swim. The markdowns on these are small, so buy what you’ll use.
Huggies Little Swimmers Size 3
Pampers Splashers Swim Diapers
Try Pampers Splashers in Medium if Huggies leave marks on your baby’s legs or you already prefer Pampers. The 11-count pack is small, which works for a fall trip or a handful of lessons. Like the Huggies, you get a modest discount on something you’d buy anyway.
- Disposable swim diapers
- Size Medium
- 11 count
Frequently asked questions
What does UPF 50 mean on a baby swimsuit?
UPF 50 means the fabric lets through about 1/50th of UV radiation, so it blocks about 98%. UPF 50+ is the highest rating on the scale. Unlike sunscreen, fabric doesn’t wear off in the water.
Is a long sleeve swimsuit better than sunscreen for a baby with fair skin?
For babies under 6 months, the American Academy of Pediatrics recommends shade and protective clothing first, with only small amounts of sunscreen on exposed skin. For older babies, a long sleeve suit shrinks the area you need to cover with sunscreen and reapply. Most families use both.
Should I buy a baby swimsuit in September?
Yes, if you size up. End-of-season markdowns on swimwear are at their deepest now. Buy one or two sizes ahead for next summer, or your baby’s current size for indoor lessons or a winter trip.
Does a baby need a swim diaper under a rash guard swimsuit?
Yes. A rash guard suit has no absorbent layer, and many public pools require a swim diaper. Ask your pool about its rules before the first lesson.
Discounts on baby swimwear this week ran from 9% to about 52%, and the split was easy to see. RuffleButts had the deepest cuts, with several prints of the same rash guard one-piece at the same markdown, and that looks like real end-of-season clearance. Gerber’s long sleeve rashguards dropped only 9% to 17%, and most of the swim diapers were stuck at 9%.
It was a solid week, but not an amazing one. The standout is the RuffleButts Novelty rash guard, since it has a #1 rank, UPF 50+ in its title and the biggest markdown. If the sleeves on the card aren’t long enough for you, the Gerber girls’ long sleeve rashguard is the safer choice at close to full price. I’d skip the Disney trunks for a fair-skinned baby unless you already have a rash guard top.
Swim listings usually keep clearing through October, but the common sizes sell out first, so if you know your size, buy now. After that, baby deals shift toward sleepers and cold-weather layers, and you can browse all current deals as they come in. A suit bought in September for next July will probably fit if you size up, and at these prices it doesn’t matter much if it doesn’t.






