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Whether it's for summertime or swimming lessons, your girls need the right gear for when they dive into the water. Check out thredUP's selection of girls' swimwear to discover items from top brands at up to 90% off estimated retail.

NylonRemove filter6XRemove filter12-18 moRemove filter
36 items
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    Ruffle Butts One Piece Swimsuit (view 2)Ruffle Butts One Piece Swimsuit (view 1)
    View Product: Ruffle Butts One Piece Swimsuit

    Ruffle Butts

    One Piece Swimsuit
    Size 12-18 mo
    $10.99
    18% off estimated retail
    Assorted Brands One Piece Swimsuit (view 2)Assorted Brands One Piece Swimsuit (view 1)
    View Product: Assorted Brands One Piece Swimsuit

    Assorted Brands

    One Piece Swimsuit
    Size 6X
    $12.99 $10.39 20% off with code HOTDEAL
    63% off estimated retail
    Cabana Life Two Piece Swimsuit (view 2)Cabana Life Two Piece Swimsuit (view 1)
    View Product: Cabana Life Two Piece Swimsuit

    Cabana Life

    Two Piece Swimsuit
    Size 6X
    $30.99 $20.14 35% off with code HOTDEAL
    58% off estimated retail
    Janie and Jack Two Piece Swimsuit (view 2)Janie and Jack Two Piece Swimsuit (view 1)
    View Product: Janie and Jack Two Piece Swimsuit

    Janie and Jack

    Two Piece Swimsuit
    Size 12-18 mo
    $22.99 $14.94 35% off with code HOTDEAL
    45% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
    Carter's One Piece Swimsuit (view 2)Carter's One Piece Swimsuit (view 1)
    View Product: Carter's One Piece Swimsuit

    Carter's

    One Piece Swimsuit
    Size 6X
    $16.99 $13.59 20% off with code HOTDEAL
    64% off estimated retail
    Janie and Jack Rash Guard (view 2)Janie and Jack Rash Guard (view 1)
    View Product: Janie and Jack Rash Guard

    Janie and Jack

    Rash Guard
    Size 12-18 mo
    $10.99 $8.79 20% off with code HOTDEAL
    71% off estimated retail
    Baby Gap One Piece Swimsuit (view 2)Baby Gap One Piece Swimsuit (view 1)
    View Product: Baby Gap One Piece Swimsuit

    Baby Gap

    One Piece Swimsuit
    Size 12-18 mo
    $13.99 $11.19 20% off with code HOTDEAL
    55% off estimated retail
    Baby Gap One Piece Swimsuit (view 2)Baby Gap One Piece Swimsuit (view 1)
    View Product: Baby Gap One Piece Swimsuit

    Baby Gap

    One Piece Swimsuit
    Size 12-18 mo
    $12.99 $10.39 20% off with code HOTDEAL
    59% off estimated retail
    Roller Rabbit One Piece Swimsuit (view 2)Roller Rabbit One Piece Swimsuit (view 1)
    View Product: Roller Rabbit One Piece Swimsuit

    Roller Rabbit

    One Piece Swimsuit
    Size 12-18 mo
    $28.99 $21.74 25% off with code HOTDEAL
    45% off estimated retail
    Baby Gap One Piece Swimsuit (view 2)Baby Gap One Piece Swimsuit (view 1)
    View Product: Baby Gap One Piece Swimsuit

    Baby Gap

    One Piece Swimsuit
    Size 12-18 mo
    $12.99 $10.39 20% off with code HOTDEAL
    59% off estimated retail
    Old Navy One Piece Swimsuit (view 2)Old Navy One Piece Swimsuit (view 1)Price Drop
    View Product: Old Navy One Piece Swimsuit

    Old Navy

    One Piece Swimsuit
    Size 12-18 mo
    $8.99 $5.84 35% off with code HOTDEAL
    55% off estimated retail
    Baby Gap One Piece Swimsuit (view 2)Baby Gap One Piece Swimsuit (view 1)Price Drop
    View Product: Baby Gap One Piece Swimsuit

    Baby Gap

    One Piece Swimsuit
    Size 12-18 mo
    $8.99 $5.84 35% off with code HOTDEAL
    70% off estimated retail
    Janie and Jack Rash Guard (view 2)Janie and Jack Rash Guard (view 1)Price Drop
    View Product: Janie and Jack Rash Guard

    Janie and Jack

    Rash Guard
    Size 12-18 mo
    $12.99 $8.44 35% off with code HOTDEAL
    64% off estimated retail
    Gymboree One Piece Swimsuit (view 2)Gymboree One Piece Swimsuit (view 1)Price Drop
    View Product: Gymboree One Piece Swimsuit

    Gymboree

    One Piece Swimsuit
    Size 12-18 mo
    $21.99 $13.19 40% off with code HOTDEAL
    33% off estimated retail
    Motion Wear One Piece Swimsuit (view 2)Motion Wear One Piece Swimsuit (view 1)Price Drop
    View Product: Motion Wear One Piece Swimsuit

    Motion Wear

    One Piece Swimsuit
    Size 6X
    $19.99 $12.99 35% off with code HOTDEAL
    56% off estimated retail
    Roller Rabbit Rash Guard (view 2)Roller Rabbit Rash Guard (view 1)Price Drop
    View Product: Roller Rabbit Rash Guard

    Roller Rabbit

    Rash Guard
    Size 6X
    $24.99 $13.74 45% off with code HOTDEAL
    70% off estimated retail
    Zero Swimsuit Cover Up (view 2)Zero Swimsuit Cover Up (view 1)Price Drop
    View Product: Zero Swimsuit Cover Up

    Zero

    Swimsuit Cover Up
    Size 6X
    $19.99 $10.00 50% off with code HOTDEAL
    57% off estimated retail
    Old Navy One Piece Swimsuit (view 2)Old Navy One Piece Swimsuit (view 1)Price Drop
    View Product: Old Navy One Piece Swimsuit

    Old Navy

    One Piece Swimsuit
    Size 12-18 mo
    $11.99 $7.19 40% off with code HOTDEAL
    38% off estimated retail
    Ruffle Butts One Piece Swimsuit (view 2)Ruffle Butts One Piece Swimsuit (view 1)Price Drop
    View Product: Ruffle Butts One Piece Swimsuit

    Ruffle Butts

    One Piece Swimsuit
    Size 12-18 mo
    $11.99 $6.59 45% off with code HOTDEAL
    $11
    Ruffle Butts Two Piece Swimsuit (view 2)Ruffle Butts Two Piece Swimsuit (view 1)Price Drop
    View Product: Ruffle Butts Two Piece Swimsuit

    Ruffle Butts

    Two Piece Swimsuit
    Size 12-18 mo
    $10.99 $6.59 40% off with code HOTDEAL
    18% off estimated retail
    Janie and Jack Rash Guard (view 2)Janie and Jack Rash Guard (view 1)Price Drop
    View Product: Janie and Jack Rash Guard

    Janie and Jack

    Rash Guard
    Size 12-18 mo
    $7.99 $4.79 40% off with code HOTDEAL
    77% off estimated retail
    Old Navy Two Piece Swimsuit (view 2)Old Navy Two Piece Swimsuit (view 1)Price Drop
    View Product: Old Navy Two Piece Swimsuit

    Old Navy

    Two Piece Swimsuit
    Size 12-18 mo
    $10.99 $6.59 40% off with code HOTDEAL
    44% off estimated retail
    Baby Gap Outlet One Piece Swimsuit (view 2)Baby Gap Outlet One Piece Swimsuit (view 1)Price Drop
    View Product: Baby Gap Outlet One Piece Swimsuit

    Baby Gap Outlet

    One Piece Swimsuit
    Size 12-18 mo
    $11.99 $7.19 40% off with code HOTDEAL
    $11
    Snapper Rock Rash Guard (view 2)Snapper Rock Rash Guard (view 1)Price Drop
    View Product: Snapper Rock Rash Guard

    Snapper Rock

    Rash Guard
    Size 12-18 mo
    $11.99 $7.19 40% off with code HOTDEAL
    37% off estimated retail
    Janie and Jack Rash Guard (view 2)Janie and Jack Rash Guard (view 1)Price Drop
    View Product: Janie and Jack Rash Guard

    Janie and Jack

    Rash Guard
    Size 12-18 mo
    $11.99 $7.19 40% off with code HOTDEAL
    67% off estimated retail
    Baby Gap One Piece Swimsuit (view 2)Baby Gap One Piece Swimsuit (view 1)Price Drop
    View Product: Baby Gap One Piece Swimsuit

    Baby Gap

    One Piece Swimsuit
    Size 12-18 mo
    $11.24 $6.74 40% off with code HOTDEAL
    66% off estimated retail
    Assorted Brands One Piece Swimsuit (view 2)Assorted Brands One Piece Swimsuit (view 1)Price Drop
    View Product: Assorted Brands One Piece Swimsuit

    Assorted Brands

    One Piece Swimsuit
    Size 12-18 mo
    $11.24 $6.74 40% off with code HOTDEAL
    59% off estimated retail
    Koala Kids One Piece Swimsuit (view 2)Koala Kids One Piece Swimsuit (view 1)Price Drop
    View Product: Koala Kids One Piece Swimsuit

    Koala Kids

    One Piece Swimsuit
    Size 12-18 mo
    $10.99 $6.59 40% off with code HOTDEAL
    10% off estimated retail
    The Children's Place One Piece Swimsuit (view 2)The Children's Place One Piece Swimsuit (view 1)Price Drop
    View Product: The Children's Place One Piece Swimsuit

    The Children's Place

    One Piece Swimsuit
    Size 12-18 mo
    $10.99 $6.59 40% off with code HOTDEAL
    50% off estimated retail
    Old Navy Two Piece Swimsuit (view 2)Old Navy Two Piece Swimsuit (view 1)New With Tags
    View Product: Old Navy Two Piece Swimsuit

    Old Navy

    Two Piece Swimsuit
    Size 12-18 mo
    $9.99 $5.99 40% off with code HOTDEAL
    28% off estimated retail
    Carter's Rash Guard (view 2)Carter's Rash Guard (view 1)Price Drop
    View Product: Carter's Rash Guard

    Carter's

    Rash Guard
    Size 6X
    $12.24 $7.34 40% off with code HOTDEAL
    66% off estimated retail
    Old Navy One Piece Swimsuit (view 2)Old Navy One Piece Swimsuit (view 1)Price Drop
    View Product: Old Navy One Piece Swimsuit

    Old Navy

    One Piece Swimsuit
    Size 12-18 mo
    $12.24 $7.34 40% off with code HOTDEAL
    50% off estimated retail
    Old Navy One Piece Swimsuit (view 2)Old Navy One Piece Swimsuit (view 1)Price Drop
    View Product: Old Navy One Piece Swimsuit

    Old Navy

    One Piece Swimsuit
    Size 12-18 mo
    $11.24 $6.74 40% off with code HOTDEAL
    47% off estimated retail
    Floatimini One Piece Swimsuit (view 2)Floatimini One Piece Swimsuit (view 1)Price Drop
    View Product: Floatimini One Piece Swimsuit

    Floatimini

    One Piece Swimsuit
    Size 12-18 mo
    $8.24 $4.94 40% off with code HOTDEAL
    86% off estimated retail
    Unbranded One Piece Swimsuit (view 2)Unbranded One Piece Swimsuit (view 1)Price Drop
    View Product: Unbranded One Piece Swimsuit

    Unbranded

    One Piece Swimsuit
    Size 12-18 mo
    $8.99 $5.39 40% off with code HOTDEAL
    60% off estimated retail
    Old Navy Outlet One Piece Swimsuit (view 2)Old Navy Outlet One Piece Swimsuit (view 1)Price Drop
    View Product: Old Navy Outlet One Piece Swimsuit

    Old Navy Outlet

    One Piece Swimsuit
    Size 12-18 mo
    $8.99 $5.39 40% off with code HOTDEAL
    20% off estimated retail
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