Hanna Andersson UPF Swim
Exceptional quality UPF 50+ knits that survive chlorine and salt.
Summer Swimwear: UPF Clothing vs. Sunscreen for Babies
Why slathering your baby in lotion is the hardest, least effective way to prevent sunburn. UPF is the ultimate mechanical shield.
R
By Renee, R3 Founder
Environmental Toxins Analyst
Updated June 2026
When you shop through retailer links on our site, we may earn affiliate commissions. R3 takes no money from brands and scores every product the same way. Learn more.
Share
Get the research before you buy
The picks that cleared safety, what to skip, and why. No spam, no sponsors.
The quick answer
For children under 2, UPF 50+ rash guards and wide-brimmed hats are vastly superior to sunscreen. Sunscreen easily washes off, is applied unevenly, and requires chemical or mineral agents sitting on an infant's delicate skin. A long-sleeve UPF swimsuit guarantees 98% UV blockage all day, mechanically, without any chemical exposure. Use mineral sunscreen strictly on the tiny exposed areas like the face, neck, and back of the hands.
In this guide:Hanna Andersson UPF SwimSunday Afternoons Play Hat
Editor's note. Reinforcing AAP recommendations against full-body sunscreen application for infants.
01
The Geometry of the Sun
Sunscreen is often treated by parents as a suit of armor, when in reality it is a highly flawed, temporary film: studies show parents routinely apply less than 50% of the requisite volume to achieve the SPF rating on the bottle, and almost no one reapplies every 80 minutes.
UPF (Ultraviolet Protection Factor) clothing is woven tightly to prevent photons from passing through, making it a mechanical barrier rather than a chemical one. The Skin Cancer Foundation's guidance on sun-protective clothing is why we lean on the rating: a UPF 50 garment blocks 98% of UV radiation, and unlike "SPF," which only measures UVB rays, the UPF rating covers both UVA and UVB.
A UPF 50 swimsuit blocks 98% of UVA and UVB rays mechanically all day, while sunscreen depends on parents applying the full volume and reapplying every 80 minutes, which few actually do.
In short
- UPF clothing provides guaranteed, immutable UV blockage.
- Sunscreen is prone to massive human error in application.
The bottom line
Buy long-sleeve, long-pant UPF 50 swimsuits. You will save enormous amounts of money on expensive mineral sunscreen, and you will save your child from the inevitable missed-spot sunburn.
Get the research before you buy
We score every product the same way and send the picks that cleared safety, what to skip, and why. No spam, no sponsors.
What we recommend
Evidence-based picks that address the concerns above.
Sunday Afternoons Play Hat
The absolute gold standard of wide-brim rear-flap neck protection.
1 more tips
Create a free account to see more buying advice
Cited research
Frequently asked questions
Common questions about seasonal: summer wellness, answered by our research team.
QDo UPF clothes lose their rating?
Yes, UPF clothing can lose its rating over time: stretching, chlorine decay, and intense washing can loosen the weave. Replace UPF swimwear if it is visibly thinning.