How to Choose Baby Swim Shorts: Fit, Fabric and Sun Safety

By Shop Luxury Women's, Kids and Baby Clothing Online ... | Published: 2026-11-02

Category: How-to Guides

A practical step-by-step guide to choosing baby swim shorts that stay put, dry fast and protect delicate skin, with fit checks, fabric cues and sun-safety habits.

Quick answer

Choose baby swim shorts that sit close at the waist without digging in, use a quick-drying swim fabric rather than cotton, and cover the upper thighs. Then treat the shorts as one part of sun safety, not a substitute for shade and sunscreen.

Why the waistband matters more than the size label

Babies change shape quickly, and a size that fits at the start of summer may ride up or slip down by August. An elasticated waist is the most forgiving choice because it adjusts to small changes without a drawstring that can loosen in water. When you try shorts on, check that you can slide one finger under the waistband and that the shorts stay put when your baby bends or kicks. If the waistband leaves red marks after a few minutes, size up rather than accepting a snug fit that will only get tighter after a meal or a nap.

Fabric choices: what to look for and what to avoid

Swim shorts should be made from a synthetic swim fabric that sheds water quickly. Cotton absorbs water, becomes heavy and stays damp against the skin, which is uncomfortable and slow to dry. You do not need to guess at performance claims: check the care label for the fibre content and follow the washing instructions. If the label is missing or vague, treat that as a limitation and choose a pair with clear fabric information instead. A discreet lining can add comfort, but if the shorts have no lining, a swim nappy underneath is still essential for babies who are not yet toilet trained.

Sun safety: shorts are only one layer

Swim shorts cover the upper legs, but they leave the lower legs, arms, neck and face exposed. Use them alongside a wide-brimmed hat, shade and sunscreen on exposed skin. Dark or tightly woven fabrics block more UV than light, loose weaves, but no ordinary swim short is a guaranteed sun block unless it carries a stated UPF rating. If the product does not list a UPF rating, do not assume one. Reapply sunscreen after every trip out of the water, and check that the shorts still cover the thighs when your baby sits or crawls.

When a print or style choice helps

A busy print is not just decorative: it hides water marks and small stains, which matters if you are changing your baby on a beach or at a pool with limited facilities. A geo print baby swim short in a darker colour can also make it easier to spot your child in a crowded paddling pool. Style should come after fit and fabric, but a print you like can make the shorts easier to live with. Just check that any logo or trim is flat and not scratchy against the skin.

How to choose baby swim shorts in six steps

Start with the waist, not the age: Measure your baby's waist and try the shorts on over a swim nappy. You should be able to slide one finger under the waistband, and the shorts should not slide down when your baby bends or kicks. Common mistake: buying the same size as everyday clothes without allowing for a nappy. If the waistband leaves marks, go up a size.
Check the leg opening: The leg openings should sit close to the thigh without pinching. Ask your baby to squat or crawl; the shorts should not ride up into the crotch. Common mistake: choosing a loose, baggy fit that balloons in water and drags. A close but comfortable leg opening keeps the shorts in place.
Read the fabric label: Look for a quick-drying swim fabric and avoid cotton. Check the care label for fibre content and washing instructions. If the label is missing, ask the retailer or choose another pair. Common mistake: assuming any shorts are swim-safe because they are sold near swimwear. No fibre information means no confident choice.
Plan for sun protection: Choose shorts that cover the upper thighs and pair them with a hat, shade and sunscreen. Do not rely on the shorts alone unless they state a UPF rating. Common mistake: skipping sunscreen on the legs because they are partly covered. Reapply sunscreen after every swim.
Decide on a nappy system: If your baby is not toilet trained, use a swim nappy under the shorts. Check that the shorts have enough room for the nappy without pulling at the waist. Common mistake: using a regular nappy, which swells in water. Swim nappies are designed not to swell.
Do a final comfort check: Before you cut off tags, have your baby wear the shorts for a few minutes indoors. Look for redness, scratching or constant tugging. Common mistake: keeping shorts that irritate because they look right. Comfort is the final test, not the size label.

Product facts

KOHLRABI BABY SWIM SHORTS - BROWN GEO PRINT: Kohlrabi Baby Swim Shorts in Brown Geo Print have an elasticated waist for easy wearing. An elasticated waist adjusts to growth and makes nappy changes faster, which is useful on beach days.
KOHLRABI BABY SWIM SHORTS - BROWN GEO PRINT
KOHLRABI BABY SWIM SHORTS - BROWN GEO PRINT: The shorts feature a discreet Caramel logo and a signature geometric print. A flat logo and busy print are practical details that reduce irritation and hide water marks.