Baby & Boys Swim Shorts: Fit & Fabric Guide

Learn how to choose swim shorts for babies and boys. This guide covers fit, fabric, and key features like elasticated waists and quick-dry materials.

Publishing teamXI LANGS Editorial

PublishedOct 23, 2026

Page updatedOct 23, 2026

Reading time4 minutes

Baby & Boys Swim Shorts: Fit & Fabric Guide

Quick answer

For babies and boys, look for swim shorts with an elasticated waist for easy changes and a comfortable fit, plus a quick-dry fabric that won't weigh them down in the water.

Why fit and fabric matter for little swimmers

Babies and toddlers have sensitive skin and are still developing temperature regulation, so the right swimwear fabric can make a big difference. Quick-dry materials help prevent chills after a swim, while a secure but gentle elasticated waist keeps shorts in place without digging in.

For older boys who are more active, a shorter leg length and a closer fit reduce drag in the water and make it easier to splash and play. A drawstring or internal elastic adjuster can also help fine-tune the fit as they grow.

Key features to look for

Elasticated waist: This is the number-one feature for babies and toddlers. It makes dressing and nappy changes quick and hassle-free, and it accommodates growth spurts without needing a new pair every few months.

Quick-dry fabric: Swim shorts made from polyester or nylon blends dry much faster than cotton. This is crucial for comfort when your child is out of the water or if you're heading home after a beach day.

Secure closure: For boys who are toilet-trained, a drawstring or adjustable elastic at the waist provides a custom fit that won't slip down during active play. Avoid metal zippers or buttons that can get hot in the sun or cause discomfort.

How to choose the right swim shorts

1. Check the waistband: For babies and toddlers who are still in nappies, an elasticated waist is non-negotiable. It allows for quick changes and a comfortable fit over a nappy. For older boys who are potty-trained, a drawstring or adjustable elastic gives a more secure fit.
2. Pick the right length: Shorter legs (mid-thigh or above) are best for active play and swimming, as they reduce drag and let little legs move freely. Longer shorts can be fine for lounging but may feel heavy in the water.
3. Choose quick-dry fabric: Look for polyester, nylon, or a blend. These fabrics dry fast, resist fading from chlorine and sun, and won't hold water like cotton. Avoid cotton swim shorts—they stay wet, get heavy, and can cause chills. If you see 'cotton' on the label, keep looking for a swim-specific fabric.
4. Prioritise sun protection: Many swim shorts now come with UPF 50+ rating. While not all do, choosing a pair with built-in sun protection adds an extra layer of defence for sensitive skin. Pair with a rash guard for full coverage.
5. Consider the closure type: For babies, skip anything with a zipper or button—they can be uncomfortable and hot. For older boys, a drawstring or internal elastic adjuster is ideal. Avoid metal parts that can get hot in direct sun.

KOHLRABI BABY SWIM SHORTS - NAVY/BLACK CHECK: Kohlrabi Baby Swim Shorts in navy and black check with a Caramel logo embellishment and an elasticated waist. The elasticated waist makes these easy to pull on and off for quick nappy changes, and the classic check pattern pairs well with any rash guard.

KOHLRABI BABY SWIM SHORTS - NAVY/BLACK CHECK
KOHLRABI BABY SWIM SHORTS - AQUA/PURPLE CHECK: Kohlrabi Baby Swim Shorts in aqua blue and purple check with a Caramel logo embellishment and an elasticated waist. The bold, bright colours are easy to spot at the pool or beach, and the quick-dry fabric helps keep your little one comfortable after splashing around.

KOHLRABI BABY SWIM SHORTS - AQUA/PURPLE CHECK