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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.

18-24 moRemove filter
46 items
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    Hanna Andersson Two Piece Swimsuit (view 2)Hanna Andersson Two Piece Swimsuit (view 1)
    View Product: Hanna Andersson Two Piece Swimsuit

    Hanna Andersson

    Two Piece Swimsuit
    Size 18-24 mo
    $25.99 $14.29 45% off with code GOBIG
    36% off estimated retail
    Old Navy One Piece Swimsuit (view 2)Old Navy One Piece Swimsuit (view 1)New With Tags
    View Product: Old Navy One Piece Swimsuit

    Old Navy

    One Piece Swimsuit
    Size 18-24 mo
    $11.99 $6.59 45% off with code GOBIG
    33% off estimated retail
    Tea Two Piece Swimsuit (view 2)Tea Two Piece Swimsuit (view 1)
    View Product: Tea Two Piece Swimsuit

    Tea

    Two Piece Swimsuit
    Size 18-24 mo
    $20.99 $11.54 45% off with code GOBIG
    56% 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 18-24 mo
    $12.99 $7.14 45% off with code GOBIG
    27% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
    Primary Clothing Rash Guard (view 2)Primary Clothing Rash Guard (view 1)
    View Product: Primary Clothing Rash Guard

    Primary Clothing

    Rash Guard
    Size 18-24 mo
    $10.99 $6.04 45% off with code GOBIG
    66% off estimated retail
    Olivia for Gymboree One Piece Swimsuit (view 2)Olivia for Gymboree One Piece Swimsuit (view 1)
    View Product: Olivia for Gymboree One Piece Swimsuit

    Olivia for Gymboree

    One Piece Swimsuit
    Size 18-24 mo
    $19.99 $10.99 45% off with code GOBIG
    42% 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 18-24 mo
    $16.99 $9.34 45% off with code GOBIG
    48% off estimated retail
    Gymboree One Piece Swimsuit (view 2)Gymboree One Piece Swimsuit (view 1)
    View Product: Gymboree One Piece Swimsuit

    Gymboree

    One Piece Swimsuit
    Size 18-24 mo
    $20.99 $11.54 45% off with code GOBIG
    37% off estimated retail
    Me and Henry Board Shorts (view 2)Me and Henry Board Shorts (view 1)
    View Product: Me and Henry Board Shorts

    Me and Henry

    Board Shorts
    Size 18-24 mo
    $9.99 $5.49 45% off with code GOBIG
    54% 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 18-24 mo
    $12.99 $7.14 45% off with code GOBIG
    63% 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 18-24 mo
    $11.99 $6.59 45% off with code GOBIG
    71% off estimated retail
    Ruffle Butts Two Piece Swimsuit (view 2)Ruffle Butts Two Piece Swimsuit (view 1)
    View Product: Ruffle Butts Two Piece Swimsuit

    Ruffle Butts

    Two Piece Swimsuit
    Size 18-24 mo
    $12.99 $7.14 45% off with code GOBIG
    $11
    Gymboree Two Piece Swimsuit (view 2)Gymboree Two Piece Swimsuit (view 1)
    View Product: Gymboree Two Piece Swimsuit

    Gymboree

    Two Piece Swimsuit
    Size 18-24 mo
    $22.99 $12.64 45% off with code GOBIG
    29% off estimated retail
    Tea Rash Guard (view 2)Tea Rash Guard (view 1)
    View Product: Tea Rash Guard

    Tea

    Rash Guard
    Size 18-24 mo
    $16.99 $9.34 45% off with code GOBIG
    48% off estimated retail
    Gymboree One Piece Swimsuit (view 2)Gymboree One Piece Swimsuit (view 1)
    View Product: Gymboree One Piece Swimsuit

    Gymboree

    One Piece Swimsuit
    Size 18-24 mo
    $22.99 $12.64 45% off with code GOBIG
    29% off estimated retail
    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 18-24 mo
    $10.99 $6.04 45% off with code GOBIG
    18% 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 18-24 mo
    $22.99 $12.64 45% off with code GOBIG
    54% off estimated retail
    Unbranded Rash Guard (view 2)Unbranded Rash Guard (view 1)
    View Product: Unbranded Rash Guard

    Unbranded

    Rash Guard
    Size 18-24 mo
    $12.99 $7.14 45% off with code GOBIG
    45% 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 18-24 mo
    $16.99 $9.34 45% off with code GOBIG
    66% off estimated retail
    UV Skinz Wetsuit (view 2)UV Skinz Wetsuit (view 1)
    View Product: UV Skinz Wetsuit

    UV Skinz

    Wetsuit
    Size 18-24 mo
    $22.99 $12.64 45% off with code GOBIG
    65% 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 18-24 mo
    $28.99 $15.94 45% off with code GOBIG
    52% 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 18-24 mo
    $10.99 $6.04 45% off with code GOBIG
    47% off estimated retail
    Gymboree One Piece Swimsuit (view 2)Gymboree One Piece Swimsuit (view 1)
    View Product: Gymboree One Piece Swimsuit

    Gymboree

    One Piece Swimsuit
    Size 18-24 mo
    $22.99 $12.64 45% off with code GOBIG
    29% off estimated retail
    The Children's Place One Piece Swimsuit (view 2)The Children's Place One Piece Swimsuit (view 1)
    View Product: The Children's Place One Piece Swimsuit

    The Children's Place

    One Piece Swimsuit
    Size 18-24 mo
    $8.99 $4.94 45% off with code GOBIG
    55% off estimated retail
    Gymboree Rash Guard (view 2)Gymboree Rash Guard (view 1)
    View Product: Gymboree Rash Guard

    Gymboree

    Rash Guard
    Size 18-24 mo
    $16.99 $9.34 45% off with code GOBIG
    39% 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 18-24 mo
    $29.99 $16.49 45% off with code GOBIG
    28% 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 18-24 mo
    $25.99 $14.29 45% off with code GOBIG
    50% off estimated retail
    Stitchy Fish Two Piece Swimsuit (view 2)Stitchy Fish Two Piece Swimsuit (view 1)
    View Product: Stitchy Fish Two Piece Swimsuit

    Stitchy Fish

    Two Piece Swimsuit
    Size 18-24 mo
    $23.99 $13.19 45% off with code GOBIG
    54% 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 18-24 mo
    $14.99 $8.24 45% off with code GOBIG
    22% 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 18-24 mo
    $12.99 $7.14 45% off with code GOBIG
    59% 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 18-24 mo
    $11.99 $6.59 45% off with code GOBIG
    63% off estimated retail
    Gymboree One Piece Swimsuit (view 2)Gymboree One Piece Swimsuit (view 1)
    View Product: Gymboree One Piece Swimsuit

    Gymboree

    One Piece Swimsuit
    Size 18-24 mo
    $22.99 $12.64 45% off with code GOBIG
    29% 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 18-24 mo
    $16.99 $9.34 45% off with code GOBIG
    48% 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 18-24 mo
    $16.99 $9.34 45% off with code GOBIG
    48% off estimated retail
    Shade Critters One Piece Swimsuit (view 2)Shade Critters One Piece Swimsuit (view 1)Price Drop
    View Product: Shade Critters One Piece Swimsuit

    Shade Critters

    One Piece Swimsuit
    Size 18-24 mo
    $18.99 $10.44 45% off with code GOBIG
    63% 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 18-24 mo
    $7.99 $4.39 45% off with code GOBIG
    80% 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 18-24 mo
    $11.99 $6.59 45% off with code GOBIG
    44% off estimated retail
    Gymboree Rash Guard (view 2)Gymboree Rash Guard (view 1)
    View Product: Gymboree Rash Guard

    Gymboree

    Rash Guard
    Size 18-24 mo
    $8.99 $4.94 45% off with code GOBIG
    65% off estimated retail
    Old Navy Swimsuit Cover Up (view 2)Old Navy Swimsuit Cover Up (view 1)Price Drop
    View Product: Old Navy Swimsuit Cover Up

    Old Navy

    Swimsuit Cover Up
    Size 18-24 mo
    $12.24 $6.73 45% off with code GOBIG
    44% 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 18-24 mo
    $9.99 $5.49 45% off with code GOBIG
    50% 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 18-24 mo
    $11.99 $6.59 45% off with code GOBIG
    44% 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 18-24 mo
    $14.24 $7.83 45% off with code GOBIG
    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 18-24 mo
    $11.24 $6.18 45% off with code GOBIG
    50% 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 18-24 mo
    $15.24 $8.38 45% off with code GOBIG
    66% 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 18-24 mo
    $12.24 $6.73 45% off with code GOBIG
    64% off estimated retail
    Gymboree Board Shorts (view 2)Gymboree Board Shorts (view 1)
    View Product: Gymboree Board Shorts

    Gymboree

    Board Shorts
    Size 18-24 mo
    $11.24 $6.18 45% off with code GOBIG
    64% off estimated retail
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