UPF Explained: Why Babies and Toddlers Need Sun-Protective Clothing

Parents often wonder whether UPF clothing is really necessary or if regular cotton provides enough protection. The truth is that everyday fabrics don’t offer reliable UV protection, and young skin is much more vulnerable. This guide explains what UPF means, why it matters, and how to choose the best sun-protective clothing for babies and toddlers.

What Does UPF Mean?

UPF stands for Ultraviolet Protection Factor, which measures how much UV radiation a fabric allows to reach the skin.

• UPF 15–24: Good

• UPF 25–39: Very good

• UPF 40–50+: Excellent

UPF 50 blocks 98% of UVA and UVB rays, making it the safest choice for children.

UPF vs SPF: What’s the Difference?

SPF is for sunscreen—it measures how long UVB rays take to burn your skin.

UPF is for clothing—it blocks both UVA & UVB before they even reach your skin.

One needs reapplying (sunscreen), the other protects all day (UPF clothing)!

How UPF Clothing Works

UPF clothing can be made in a few different ways, and often it’s a combination of factors working together:

1. Fabric structure

Some fabrics are naturally more protective because of:

• Tighter weaves or knits that let less light through

• Thicker or denser yarns

• Certain fibers (like some poly blends) that better block UV

In these cases, the protection comes mostly from the way the fabric is built.

2. Added UV treatments

Other UPF fabrics use special UV-absorbing treatments or finishes that are added during the manufacturing process. These treatments help the fabric absorb or block more UV rays than it would on its own.

Over time, heavy wear, washing, and exposure can affect treated fabrics, so it’s always a good idea to:

• Follow the care label

• Replace pieces that are very worn or thinned out. 

Keep in mind - this approach, the treatment washes off over time.

Want to understand the difference between chemical and chemical-free UPF fabrics? Here’s a parent-friendly breakdown → https://sunnycubs.com/blogs/sun-resources/chemical-vs-chemical-free-upf

3. Design and coverage

Even the best fabric only protects the skin it actually covers. Long sleeves, hoods, higher necklines, and longer hems all help increase real-world protection for babies and toddlers.

The most important thing for parents to look for is a clearly labeled UPF 50 rating, from a brand that’s transparent about sun protection. If chemical-free is important to you, typically a brand shares that up front (like Sunny Cubs).

Why UPF Matters Even on Cloudy Days

Up to 80% of UV rays can pass through thin clouds.

Heat and sunshine aren’t the same thing — UV exposure can still be high even when temperatures feel mild.

Why Babies and Toddlers Especially Need Sun Protection

Their skin is thinner, produces less melanin, and heats up faster. Toddlers also rarely stay still, making it harder to keep sunscreen on them. UPF clothing offers reliable, long-lasting coverage in any setting.

If you’re looking for a complete sun-safety routine for babies, start with this guide → https://sunnycubs.com/blogs/sun-resources/baby-sun-protection

How to Choose UPF Clothing for Little Ones

Look for:

• UPF 50 rating

• Lightweight, breathable fabric

• Comfortable stretch

• Quick-dry performance

• Full-coverage silhouettes

• Easy on/off designs (zippers or snaps)

• Loose fit

What Makes Sunny Cubs UPF Clothing Unique

For Babies:

Our Adventure Sun Suit (coming soon) UPF 50 is designed for full coverage, maximum breathability, and active outdoor play. Soft, natural fibers and chemical-free for babies skin was a priority in the design phase.

For Toddlers:

The UPF 50 Toddler Sun Hoodie protects the shoulders, arms, neck, and back — the spots toddlers burn most often.

For toddlers, sun protection looks a little different. Here’s how to keep them cool and protected → https://sunnycubs.com/blogs/sun-resources/toddler-sun-safety

Final Thoughts

UPF clothing is one of the simplest, most effective tools for sun protection. It reduces sunscreen battles, keeps skin safer, and makes outdoor time easier for families.

Baby Adventure Sun Suit 

Shop the Toddler Sun Hoodie