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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.

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52 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
    $9.99 $5.49 45% off with code GOBIG
    $11
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 6X
    $13.99 $7.69 45% off with code GOBIG
    17% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 5
    $14.99 $8.24 45% off with code GOBIG
    11% 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 5
    $16.99 $9.34 45% off with code GOBIG
    44% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
    Petit Peony One Piece Swimsuit (view 2)Petit Peony One Piece Swimsuit (view 1)
    View Product: Petit Peony One Piece Swimsuit

    Petit Peony

    One Piece Swimsuit
    Size 5
    $18.99 $10.44 45% off with code GOBIG
    72% off estimated retail
    Polo by Ralph Lauren Rash Guard (view 2)Polo by Ralph Lauren Rash Guard (view 1)
    View Product: Polo by Ralph Lauren Rash Guard

    Polo by Ralph Lauren

    Rash Guard
    Size 5
    $12.99 $7.14 45% off with code GOBIG
    67% off estimated retail
    Millie Loves Lily Rash Guard (view 2)Millie Loves Lily Rash Guard (view 1)
    View Product: Millie Loves Lily Rash Guard

    Millie Loves Lily

    Rash Guard
    Size 5
    $17.99 $9.89 45% off with code GOBIG
    52% off estimated retail
    Disney One Piece Swimsuit (view 2)Disney One Piece Swimsuit (view 1)
    View Product: Disney One Piece Swimsuit

    Disney

    One Piece Swimsuit
    Size 5
    $14.99 $8.24 45% off with code GOBIG
    42% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 6X
    $8.99 $4.94 45% off with code GOBIG
    53% off estimated retail
    Tea Rash Guard (view 2)Tea Rash Guard (view 1)
    View Product: Tea Rash Guard

    Tea

    Rash Guard
    Size 12-18 mo
    $13.99 $7.69 45% off with code GOBIG
    55% off estimated retail
    OshKosh B'gosh Board Shorts (view 2)OshKosh B'gosh Board Shorts (view 1)New With Tags
    View Product: OshKosh B'gosh Board Shorts

    OshKosh B'gosh

    Board Shorts
    Size 5
    $7.99 $4.39 45% off with code GOBIG
    15% off estimated retail
    Baby Gap Rash Guard (view 2)Baby Gap Rash Guard (view 1)
    View Product: Baby Gap Rash Guard

    Baby Gap

    Rash Guard
    Size 12-18 mo
    $13.99 $7.69 45% off with code GOBIG
    42% 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 $17.04 45% off with code GOBIG
    58% off estimated retail
    Crazy Shirts Board Shorts (view 2)Crazy Shirts Board Shorts (view 1)New With Tags
    View Product: Crazy Shirts Board Shorts

    Crazy Shirts

    Board Shorts
    Size 5
    $19.99 $10.99 45% off with code GOBIG
    54% off estimated retail
    Justice One Piece Swimsuit (view 2)Justice One Piece Swimsuit (view 1)
    View Product: Justice One Piece Swimsuit

    Justice

    One Piece Swimsuit
    Size 20
    $16.99 $9.34 45% off with code GOBIG
    44% off estimated retail
    Boardies Apparel Board Shorts (view 2)Boardies Apparel Board Shorts (view 1)
    View Product: Boardies Apparel Board Shorts

    Boardies Apparel

    Board Shorts
    Size 5
    $13.99 $7.69 45% off with code GOBIG
    63% off estimated retail
    Speedo One Piece Swimsuit (view 2)Speedo One Piece Swimsuit (view 1)
    View Product: Speedo One Piece Swimsuit

    Speedo

    One Piece Swimsuit
    Size 5
    $12.99 $7.14 45% off with code GOBIG
    40% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 6X
    $15.99 $8.79 45% off with code GOBIG
    23% off estimated retail
    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 $9.34 45% off with code GOBIG
    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 $6.04 45% off with code GOBIG
    71% off estimated retail
    Penelope Mack One Piece Swimsuit (view 2)Penelope Mack One Piece Swimsuit (view 1)
    View Product: Penelope Mack One Piece Swimsuit

    Penelope Mack

    One Piece Swimsuit
    Size 5
    $12.99 $7.14 45% off with code GOBIG
    59% off estimated retail
    Baby Gap Board Shorts (view 2)Baby Gap Board Shorts (view 1)
    View Product: Baby Gap Board Shorts

    Baby Gap

    Board Shorts
    Size 12-18 mo
    $9.99 $5.49 45% off with code GOBIG
    57% off estimated retail
    Janie and Jack One Piece Swimsuit (view 2)Janie and Jack One Piece Swimsuit (view 1)
    View Product: Janie and Jack One Piece Swimsuit

    Janie and Jack

    One Piece Swimsuit
    Size 12-18 mo
    $17.99 $9.89 45% off with code GOBIG
    64% off estimated retail
    UV Skinz Rash Guard (view 2)UV Skinz Rash Guard (view 1)
    View Product: UV Skinz Rash Guard

    UV Skinz

    Rash Guard
    Size 12-18 mo
    $15.99 $8.79 45% off with code GOBIG
    51% off estimated retail
    Lands' End One Piece Swimsuit (view 2)Lands' End One Piece Swimsuit (view 1)
    View Product: Lands' End One Piece Swimsuit

    Lands' End

    One Piece Swimsuit
    Size 5
    $16.99 $9.34 45% off with code GOBIG
    48% 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 $15.94 45% off with code GOBIG
    45% off estimated retail
    Old Navy One Piece Swimsuit (view 2)Old Navy One Piece Swimsuit (view 1)
    View Product: Old Navy One Piece Swimsuit

    Old Navy

    One Piece Swimsuit
    Size 12-18 mo
    $11.99 $6.59 45% off with code GOBIG
    38% off estimated retail
    Cat & Jack Rash Guard (view 2)Cat & Jack Rash Guard (view 1)Price Drop
    View Product: Cat & Jack Rash Guard

    Cat & Jack

    Rash Guard
    Size 6X
    $10.99 $6.04 45% off with code GOBIG
    55% 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 5
    $16.99 $9.34 45% off with code GOBIG
    40% off estimated retail
    Disney for Baby Gap Board Shorts (view 2)Disney for Baby Gap Board Shorts (view 1)
    View Product: Disney for Baby Gap Board Shorts

    Disney for Baby Gap

    Board Shorts
    Size 12-18 mo
    $9.99 $5.49 45% off with code GOBIG
    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 $10.99 45% off with code GOBIG
    56% off estimated retail
    Unbranded Board Shorts (view 2)Unbranded Board Shorts (view 1)Price Drop
    View Product: Unbranded Board Shorts

    Unbranded

    Board Shorts
    Size 20
    $12.99 $7.14 45% off with code GOBIG
    45% 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
    $23.99 $13.19 45% off with code GOBIG
    70% off estimated retail
    Boden Two Piece Swimsuit (view 2)Boden Two Piece Swimsuit (view 1)Price Drop
    View Product: Boden Two Piece Swimsuit

    Boden

    Two Piece Swimsuit
    Size 5
    $16.99 $9.34 45% off with code GOBIG
    65% off estimated retail
    Stella Cove One Piece Swimsuit (view 2)Stella Cove One Piece Swimsuit (view 1)Price Drop
    View Product: Stella Cove One Piece Swimsuit

    Stella Cove

    One Piece Swimsuit
    Size 12-18 mo
    $11.99 $6.59 45% off with code GOBIG
    63% off estimated retail
    Unbranded Rash Guard (view 2)Unbranded Rash Guard (view 1)Price Drop
    View Product: Unbranded Rash Guard

    Unbranded

    Rash Guard
    Size 12-18 mo
    $9.99 $5.49 45% off with code GOBIG
    59% 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 $6.04 45% off with code GOBIG
    44% off estimated retail
    Peek Rash Guard (view 2)Peek Rash Guard (view 1)Price Drop
    View Product: Peek Rash Guard

    Peek

    Rash Guard
    Size 12-18 mo
    $10.99 $6.04 45% off with code GOBIG
    66% off estimated retail
    Max Grey One Piece Swimsuit (view 2)Max Grey One Piece Swimsuit (view 1)Price Drop
    View Product: Max Grey One Piece Swimsuit

    Max Grey

    One Piece Swimsuit
    Size 12-18 mo
    $9.99 $5.49 45% off with code GOBIG
    18% 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 $6.59 45% off with code GOBIG
    $11
    Cat & Jack Rash Guard (view 2)Cat & Jack Rash Guard (view 1)Price Drop
    View Product: Cat & Jack Rash Guard

    Cat & Jack

    Rash Guard
    Size 6X
    $11.99 $6.59 45% off with code GOBIG
    50% off estimated retail
    Lands' End One Piece Swimsuit (view 2)Lands' End One Piece Swimsuit (view 1)Price Drop
    View Product: Lands' End One Piece Swimsuit

    Lands' End

    One Piece Swimsuit
    Size 12-18 mo
    $12.24 $6.73 45% off with code GOBIG
    65% 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 $6.59 45% off with code GOBIG
    67% 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 $6.18 45% off with code GOBIG
    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 $6.04 45% off with code GOBIG
    10% 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
    $8.99 $4.94 45% off with code GOBIG
    60% 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 $6.73 45% off with code GOBIG
    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
    $12.24 $6.73 45% off with code GOBIG
    63% 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 $6.73 45% off with code GOBIG
    50% off estimated retail
    H&M One Piece Swimsuit (view 2)H&M One Piece Swimsuit (view 1)Price Drop
    View Product: H&M One Piece Swimsuit

    H&M

    One Piece Swimsuit
    Size 12-18 mo
    $11.24 $6.18 45% off with code GOBIG
    40% off estimated retail
    UV Skinz Rash Guard (view 2)UV Skinz Rash Guard (view 1)Price Drop
    View Product: UV Skinz Rash Guard

    UV Skinz

    Rash Guard
    Size 12-18 mo
    $11.24 $6.18 45% off with code GOBIG
    65% 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 $4.94 45% off with code GOBIG
    60% off estimated retail
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