Shop Girls' Swimsuits for Every Age & Activity
Find the perfect girls' swimsuits and girls' swimwear for every age and activity — from toddler sizes 2T through teen size 16. Whether she's joining a swim team, splashing at the pool, or heading to the beach, SwimOutlet carries 450+ girls' bathing suits including one-pieces, bikinis, tankinis, rash guards, and swim shorts from Speedo, TYR, Arena, Kanu Surf, and more.
Girls' Swimsuits by Age Group
For toddlers and little girls (2T–6X), look for one-piece swimsuits with UPF 50+ protection, snap closures for easy changes, and bright colors that are easy to spot near water. Tweens (7–12) have more style options including tankinis, sporty two-pieces, and competition-ready practice suits. For teen girls, our collection includes age-appropriate bikinis, athletic one-pieces, and modest swimwear with full coverage and support.
Shop by Style: One Pieces, Bikinis, Tankinis & More
One-piece swimsuits remain the most popular choice for girls' swimming — they offer full coverage, stay in place during active play, and work for both recreational and competitive swimming. Tankinis provide the convenience of a two-piece with more coverage than a bikini, making them a favorite for tweens. For swim team training, look for girls' competition swimsuits in chlorine-resistant fabrics that hold their shape season after season.
Girls' Swimwear by Activity
For swim team and lap training, chlorine-resistant one-pieces from Speedo and TYR are built to last hundreds of pool sessions. For beach and vacation, fun prints and bright colors let her express her style. For full sun protection, pair any swimsuit with a girls' rash guard or choose a sunsuit that covers shoulders and arms with UPF 50+ rated fabric.
How to Choose the Right Girls' Swimsuit
Fit is everything for active kids. Look for suits with comfortable straps that don't dig in, fabric that stretches without losing shape, and enough coverage for her activity level. For frequent swimmers, choose polyester-blend fabrics designed to resist chlorine damage. For beach and casual use, nylon-spandex blends offer a softer feel and more vibrant prints. When in doubt, check the brand's size chart — sizing varies between Speedo, TYR, and fashion-forward brands like Billabong and Roxy.
Girls' Swimwear Sizing & FAQ
What size girls' swimsuit should I buy?
Girls' swimsuits are typically sized by age (2T, 3T, 4, 5, 6, 6X for toddlers and little girls) and then by numeric size (7–16) for big girls and teens. Sizes vary between brands, so always check the brand's size chart before ordering. If your daughter is between sizes, sizing up usually works better — a slightly loose suit is more comfortable than one that's too tight.
What's the best swimsuit material for girls who swim frequently?
For frequent swimmers, choose chlorine-resistant fabrics made from polyester blends (like Speedo Endurance+ or TYR Durafast Elite). These materials hold their shape, color, and stretch far longer than standard nylon-spandex suits in chlorinated pools. A chlorine-resistant suit can last an entire swim season of daily practice, while regular suits may fade and stretch out within weeks.
What are the best swimsuit styles for tweens?
Tankinis are a favorite for tweens because they offer the convenience of a two-piece with more coverage. Sporty one-pieces with fun cutouts or cross-back straps also work well for active girls. For swim team, a basic practice one-piece in a solid color is the standard. Let her pick a style she feels confident in — she'll enjoy swimming more when she loves what she's wearing.
Do girls' swimsuits have UPF sun protection?
Many girls' swimsuits and rash guards offer UPF 50+ sun protection, which blocks 98% of UV rays. Rash guards and sunsuits provide the most coverage, while standard swimsuits protect covered areas only. For all-day outdoor swimming, pair a swimsuit with a UPF-rated rash guard and reapply waterproof sunscreen to exposed skin every two hours.
One piece vs. two piece — which is better for my daughter?
One-pieces are generally better for active swimming, swim lessons, and water parks because they stay in place and provide full coverage. Two-pieces (bikinis and tankinis) are easier for bathroom breaks and are popular for casual pool and beach days. For toddlers, one-pieces with snap closures simplify diaper changes. For older girls, a tankini offers a practical compromise between the two.